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ACT Exam  >  ACT Questions  >  Where do volcanic rocks come from?a)Below the... Start Learning for Free
Where do volcanic rocks come from?
  • a)
    Below the surface of the earth
  • b)
    On the surface of the earth 
  • c)
    Inside the cored. Between the mantle and the core
  • d)
    None of the above
Correct answer is option 'B'. Can you explain this answer?
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Where do volcanic rocks come from?a)Below the surface of the earthb)On...
When magma escapes and cools above or very near the Earth’s surface, extrusive or volcanic igneous rock is formed. And those are the rocks that emerge when volcanoes erupt and crevices ooze.
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Where do volcanic rocks come from?a)Below the surface of the earthb)On...
On the surface of the earth
Volcanic rocks come from below the surface of the earth but are typically found on the surface. Here is how volcanic rocks are formed and where they come from:

Formation of volcanic rocks:
- Volcanic rocks are formed through the solidification of molten rock material called magma.
- Magma can be generated by the melting of rocks in the Earth's mantle or crust due to high temperatures and pressure.
- When magma erupts onto the Earth's surface through volcanic activity, it cools and solidifies to form volcanic rocks.

Location of volcanic rocks:
- Once volcanic rocks are formed, they are typically found on the surface of the earth.
- Volcanic rocks can be found near volcanic vents, on the flanks of volcanoes, or in volcanic fields.
- They can also be found in areas where ancient volcanic activity has occurred, such as volcanic islands or regions with a history of volcanic eruptions.

Characteristics of volcanic rocks:
- Volcanic rocks are often dark in color and can range from fine-grained to coarse-grained depending on the cooling rate of the magma.
- Common types of volcanic rocks include basalt, andesite, and rhyolite, each with unique mineral compositions and textures.
- Volcanic rocks can also contain gas bubbles, known as vesicles, which form as dissolved gases escape from the magma during eruption.
In summary, while volcanic rocks originate from below the surface of the earth through volcanic activity, they are typically found on the surface where they form unique geological features and landscapes.
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Directions:In the passages that follow, some words and phrases are underlined and numbered. In the answer column, you will find alternatives for the words and phrases that are underlined. If you think that the original version is best, choose “NO CHANGE,”. You will also find questions about a particular section of the passage, or about the entire passage. These questions will be identified either by an underlined portion or by a number in a box. Look for the answer that clearly expresses the idea, is consistent with the style and tone of the passage, and makes the correct use of standard written English. Read the passage through once before answering the questions. For some questions, you should read beyond the indicated portion before you answer.PassageHow Volcanoes WorkWhat causes the formation of volcanoes? Before humans understood that the center of the Earth was made of molten iron, scientific hypotheses pointed to chemical reactions in superficial layers of magma to explain the phenomenon. Through modern geology, humans have a clearer—though hardly complete—understanding of the mechanism of magma flow, (1) and can analyze the vibrations of the earth to warn of (2) recent eruptions.(3)Most volcanoes were being the result of magma flowing 63 out of the surface of the earth and hardening, usually near a subduction zone. As two tectonic plates collide, (4) one of them is forced under the other, and the seabed rock melts to form new, low-density magma.(5) This magma is red-hot and eventually penetrates unstable pockets of the Earth’s surface. Some magma will succeed in reaching the surface either to form a new volcano or (6) adding more mass to an existing one. Not all volcanoes are formed at continental boundaries, however.(7)Hotspot volcanoes form by a different mechanism. One theory, proposed in the 1960s, seeks to explain volcanoes such as those that formed the Hawaiian Islands, which are not at a plate boundary. The probable explanation is a hotspot, which is a fixed point beneath the Earth’s crust where a narrow plume of magma rises into the crust and appears at the surface as a continental volcano or a volcanic island. (8) Chains, of volcanic islands called archipelagos, provide evidence that the hotspot stays in place as the tectonic plate passes over it.Geologic processes are (9) slow, while research must include the study of ancient human accounts of eruptions and layers of rock millions of years old.(10) In general, eruptions seem to occur every several hundred or even thousand years, and many volcanoes seem to be completely dormant, (11) that is unlikely to erupt soon. No one can say for sure that these volcanoes will not erupt again in the future, so scientists (12) take serious the study of every volcano situated where a future eruption could bring significant human loss and environmental damage. Predicting volcanic eruptions is not an exact science, and only within the briefest geological moment can people (13) warn to evacuate. Through studying the earth’s vibrations, physical deformation, and gas emissions, geologists in recent decades have made several excellent predictions ofvolcanic eruption, (14) as if at the Philippines’ Mount Pinatubo in 1991 and Popocatepetl outside Mexico City in 2000.Understanding the mechanisms of the earth’s interior and continuing to study volcanoes will advance the development of reliable early warning systems for dangerous eruptions. Volcanoes are both feared and revered for their beauty and awesome destructive power, (15) but they show that humans have much more to learn about the planet Earth.Q. (8)

Directions:In the passages that follow, some words and phrases are underlined and numbered. In the answer column, you will find alternatives for the words and phrases that are underlined. If you think that the original version is best, choose “NO CHANGE,”. You will also find questions about a particular section of the passage, or about the entire passage. These questions will be identified either by an underlined portion or by a number in a box. Look for the answer that clearly expresses the idea, is consistent with the style and tone of the passage, and makes the correct use of standard written English. Read the passage through once before answering the questions. For some questions, you should read beyond the indicated portion before you answer.PassageHow Volcanoes WorkWhat causes the formation of volcanoes? Before humans understood that the center of the Earth was made of molten iron, scientific hypotheses pointed to chemical reactions in superficial layers of magma to explain the phenomenon. Through modern geology, humans have a clearer—though hardly complete—understanding of the mechanism of magma flow, (1) and can analyze the vibrations of the earth to warn of (2) recent eruptions.(3)Most volcanoes were being the result of magma flowing 63 out of the surface of the earth and hardening, usually near a subduction zone. As two tectonic plates collide, (4) one of them is forced under the other, and the seabed rock melts to form new, low-density magma.(5) This magma is red-hot and eventually penetrates unstable pockets of the Earth’s surface. Some magma will succeed in reaching the surface either to form a new volcano or (6) adding more mass to an existing one. Not all volcanoes are formed at continental boundaries, however.(7)Hotspot volcanoes form by a different mechanism. One theory, proposed in the 1960s, seeks to explain volcanoes such as those that formed the Hawaiian Islands, which are not at a plate boundary. The probable explanation is a hotspot, which is a fixed point beneath the Earth’s crust where a narrow plume of magma rises into the crust and appears at the surface as a continental volcano or a volcanic island. (8) Chains, of volcanic islands called archipelagos, provide evidence that the hotspot stays in place as the tectonic plate passes over it.Geologic processes are (9) slow, while research must include the study of ancient human accounts of eruptions and layers of rock millions of years old.(10) In general, eruptions seem to occur every several hundred or even thousand years, and many volcanoes seem to be completely dormant, (11) that is unlikely to erupt soon. No one can say for sure that these volcanoes will not erupt again in the future, so scientists (12) take serious the study of every volcano situated where a future eruption could bring significant human loss and environmental damage. Predicting volcanic eruptions is not an exact science, and only within the briefest geological moment can people (13) warn to evacuate. Through studying the earth’s vibrations, physical deformation, and gas emissions, geologists in recent decades have made several excellent predictions ofvolcanic eruption, (14) as if at the Philippines’ Mount Pinatubo in 1991 and Popocatepetl outside Mexico City in 2000.Understanding the mechanisms of the earth’s interior and continuing to study volcanoes will advance the development of reliable early warning systems for dangerous eruptions. Volcanoes are both feared and revered for their beauty and awesome destructive power, (15) but they show that humans have much more to learn about the planet Earth.Q. (4)

Directions:In the passages that follow, some words and phrases are underlined and numbered. In the answer column, you will find alternatives for the words and phrases that are underlined. If you think that the original version is best, choose “NO CHANGE,”. You will also find questions about a particular section of the passage, or about the entire passage. These questions will be identified either by an underlined portion or by a number in a box. Look for the answer that clearly expresses the idea, is consistent with the style and tone of the passage, and makes the correct use of standard written English. Read the passage through once before answering the questions. For some questions, you should read beyond the indicated portion before you answer.PassageHow Volcanoes WorkWhat causes the formation of volcanoes? Before humans understood that the center of the Earth was made of molten iron, scientific hypotheses pointed to chemical reactions in superficial layers of magma to explain the phenomenon. Through modern geology, humans have a clearer—though hardly complete—understanding of the mechanism of magma flow, (1) and can analyze the vibrations of the earth to warn of (2) recent eruptions.(3)Most volcanoes were being the result of magma flowing 63 out of the surface of the earth and hardening, usually near a subduction zone. As two tectonic plates collide, (4) one of them is forced under the other, and the seabed rock melts to form new, low-density magma.(5) This magma is red-hot and eventually penetrates unstable pockets of the Earth’s surface. Some magma will succeed in reaching the surface either to form a new volcano or (6) adding more mass to an existing one. Not all volcanoes are formed at continental boundaries, however.(7)Hotspot volcanoes form by a different mechanism. One theory, proposed in the 1960s, seeks to explain volcanoes such as those that formed the Hawaiian Islands, which are not at a plate boundary. The probable explanation is a hotspot, which is a fixed point beneath the Earth’s crust where a narrow plume of magma rises into the crust and appears at the surface as a continental volcano or a volcanic island. (8) Chains, of volcanic islands called archipelagos, provide evidence that the hotspot stays in place as the tectonic plate passes over it.Geologic processes are (9) slow, while research must include the study of ancient human accounts of eruptions and layers of rock millions of years old.(10) In general, eruptions seem to occur every several hundred or even thousand years, and many volcanoes seem to be completely dormant, (11) that is unlikely to erupt soon. No one can say for sure that these volcanoes will not erupt again in the future, so scientists (12) take serious the study of every volcano situated where a future eruption could bring significant human loss and environmental damage. Predicting volcanic eruptions is not an exact science, and only within the briefest geological moment can people (13) warn to evacuate. Through studying the earth’s vibrations, physical deformation, and gas emissions, geologists in recent decades have made several excellent predictions ofvolcanic eruption, (14) as if at the Philippines’ Mount Pinatubo in 1991 and Popocatepetl outside Mexico City in 2000.Understanding the mechanisms of the earth’s interior and continuing to study volcanoes will advance the development of reliable early warning systems for dangerous eruptions. Volcanoes are both feared and revered for their beauty and awesome destructive power, (15) but they show that humans have much more to learn about the planet Earth.Q. (1)

Directions:In the passages that follow, some words and phrases are underlined and numbered. In the answer column, you will find alternatives for the words and phrases that are underlined. If you think that the original version is best, choose “NO CHANGE,”. You will also find questions about a particular section of the passage, or about the entire passage. These questions will be identified either by an underlined portion or by a number in a box. Look for the answer that clearly expresses the idea, is consistent with the style and tone of the passage, and makes the correct use of standard written English. Read the passage through once before answering the questions. For some questions, you should read beyond the indicated portion before you answer.PassageHow Volcanoes WorkWhat causes the formation of volcanoes? Before humans understood that the center of the Earth was made of molten iron, scientific hypotheses pointed to chemical reactions in superficial layers of magma to explain the phenomenon. Through modern geology, humans have a clearer—though hardly complete—understanding of the mechanism of magma flow, (1) and can analyze the vibrations of the earth to warn of (2) recent eruptions.(3)Most volcanoes were being the result of magma flowing 63 out of the surface of the earth and hardening, usually near a subduction zone. As two tectonic plates collide, (4) one of them is forced under the other, and the seabed rock melts to form new, low-density magma.(5) This magma is red-hot and eventually penetrates unstable pockets of the Earth’s surface. Some magma will succeed in reaching the surface either to form a new volcano or (6) adding more mass to an existing one. Not all volcanoes are formed at continental boundaries, however.(7)Hotspot volcanoes form by a different mechanism. One theory, proposed in the 1960s, seeks to explain volcanoes such as those that formed the Hawaiian Islands, which are not at a plate boundary. The probable explanation is a hotspot, which is a fixed point beneath the Earth’s crust where a narrow plume of magma rises into the crust and appears at the surface as a continental volcano or a volcanic island. (8) Chains, of volcanic islands called archipelagos, provide evidence that the hotspot stays in place as the tectonic plate passes over it.Geologic processes are (9) slow, while research must include the study of ancient human accounts of eruptions and layers of rock millions of years old.(10) In general, eruptions seem to occur every several hundred or even thousand years, and many volcanoes seem to be completely dormant, (11) that is unlikely to erupt soon. No one can say for sure that these volcanoes will not erupt again in the future, so scientists (12) take serious the study of every volcano situated where a future eruption could bring significant human loss and environmental damage. Predicting volcanic eruptions is not an exact science, and only within the briefest geological moment can people (13) warn to evacuate. Through studying the earth’s vibrations, physical deformation, and gas emissions, geologists in recent decades have made several excellent predictions ofvolcanic eruption, (14) as if at the Philippines’ Mount Pinatubo in 1991 and Popocatepetl outside Mexico City in 2000.Understanding the mechanisms of the earth’s interior and continuing to study volcanoes will advance the development of reliable early warning systems for dangerous eruptions. Volcanoes are both feared and revered for their beauty and awesome destructive power, (15) but they show that humans have much more to learn about the planet Earth.Q. (11)

Directions:In the passages that follow, some words and phrases are underlined and numbered. In the answer column, you will find alternatives for the words and phrases that are underlined. If you think that the original version is best, choose “NO CHANGE,”. You will also find questions about a particular section of the passage, or about the entire passage. These questions will be identified either by an underlined portion or by a number in a box. Look for the answer that clearly expresses the idea, is consistent with the style and tone of the passage, and makes the correct use of standard written English. Read the passage through once before answering the questions. For some questions, you should read beyond the indicated portion before you answer.PassageHow Volcanoes WorkWhat causes the formation of volcanoes? Before humans understood that the center of the Earth was made of molten iron, scientific hypotheses pointed to chemical reactions in superficial layers of magma to explain the phenomenon. Through modern geology, humans have a clearer—though hardly complete—understanding of the mechanism of magma flow, (1) and can analyze the vibrations of the earth to warn of (2) recent eruptions.(3)Most volcanoes were being the result of magma flowing 63 out of the surface of the earth and hardening, usually near a subduction zone. As two tectonic plates collide, (4) one of them is forced under the other, and the seabed rock melts to form new, low-density magma.(5) This magma is red-hot and eventually penetrates unstable pockets of the Earth’s surface. Some magma will succeed in reaching the surface either to form a new volcano or (6) adding more mass to an existing one. Not all volcanoes are formed at continental boundaries, however.(7)Hotspot volcanoes form by a different mechanism. One theory, proposed in the 1960s, seeks to explain volcanoes such as those that formed the Hawaiian Islands, which are not at a plate boundary. The probable explanation is a hotspot, which is a fixed point beneath the Earth’s crust where a narrow plume of magma rises into the crust and appears at the surface as a continental volcano or a volcanic island. (8) Chains, of volcanic islands called archipelagos, provide evidence that the hotspot stays in place as the tectonic plate passes over it.Geologic processes are (9) slow, while research must include the study of ancient human accounts of eruptions and layers of rock millions of years old.(10) In general, eruptions seem to occur every several hundred or even thousand years, and many volcanoes seem to be completely dormant, (11) that is unlikely to erupt soon. No one can say for sure that these volcanoes will not erupt again in the future, so scientists (12) take serious the study of every volcano situated where a future eruption could bring significant human loss and environmental damage. Predicting volcanic eruptions is not an exact science, and only within the briefest geological moment can people (13) warn to evacuate. Through studying the earth’s vibrations, physical deformation, and gas emissions, geologists in recent decades have made several excellent predictions ofvolcanic eruption, (14) as if at the Philippines’ Mount Pinatubo in 1991 and Popocatepetl outside Mexico City in 2000.Understanding the mechanisms of the earth’s interior and continuing to study volcanoes will advance the development of reliable early warning systems for dangerous eruptions. Volcanoes are both feared and revered for their beauty and awesome destructive power, (15) but they show that humans have much more to learn about the planet Earth.Q. (9)

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Where do volcanic rocks come from?a)Below the surface of the earthb)On the surface of the earthc)Inside the cored. Between the mantle and the cored)None of the aboveCorrect answer is option 'B'. Can you explain this answer?
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