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The rocks formed from molten magma, are called
- a)sedimentary rocks
- b)igneous rocks
- c)metamorphic rocks
- d)none of these
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
The rocks formed from molten magma, are calleda)sedimentary rocksb)ign...
Igneous rock is formed through the cooling and solidification of magma or lava. Igneous rock may form with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.
igneous rock (derived from the Latin word ignis meaning fire), or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rock is formed through the cooling and solidification of magma or lava. The magma can be derived from partial melts of existing rocks in either a planet's mantle or crust. Typically, the melting is caused by one or more of three processes: an increase in temperature, a decrease in pressure, or a change in composition. Solidification into rock occurs either below the surface as intrusive rocks or on the surface as extrusive rocks. Igneous rock may form with crystallization to form granular, crystalline rocks, or without crystallization to form natural glasses.
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The rocks formed from molten magma, are calleda)sedimentary rocksb)ign...
Answer:
Igneous Rocks:
Igneous rocks are formed from the solidification and crystallization of molten magma. Magma is a molten mixture of rock-forming substances, gases, and sometimes water. When magma cools and solidifies, it forms igneous rocks. These rocks are classified into two types based on their formation process:
1. Extrusive Igneous Rocks:
Extrusive igneous rocks are formed when magma erupts onto the Earth's surface or cools rapidly in the near-surface environment. The rapid cooling prevents the growth of large crystals, resulting in fine-grained or glassy textures. Examples of extrusive igneous rocks include basalt, andesite, and rhyolite.
2. Intrusive Igneous Rocks:
Intrusive igneous rocks are formed when magma cools slowly beneath the Earth's surface. The slow cooling allows for the growth of large crystals, resulting in coarse-grained textures. Examples of intrusive igneous rocks include granite, diorite, and gabbro.
Reason for Option B:
The question asks about the rocks formed from molten magma. Sedimentary rocks are formed by the deposition and lithification of sediments, while metamorphic rocks are formed by the transformation of existing rocks through heat and pressure. Neither of these processes involves the solidification of magma. Therefore, the correct answer is option B, igneous rocks.
Igneous Rocks:
Igneous rocks are formed from the solidification and crystallization of molten magma. Magma is a molten mixture of rock-forming substances, gases, and sometimes water. When magma cools and solidifies, it forms igneous rocks. These rocks are classified into two types based on their formation process:
1. Extrusive Igneous Rocks:
Extrusive igneous rocks are formed when magma erupts onto the Earth's surface or cools rapidly in the near-surface environment. The rapid cooling prevents the growth of large crystals, resulting in fine-grained or glassy textures. Examples of extrusive igneous rocks include basalt, andesite, and rhyolite.
2. Intrusive Igneous Rocks:
Intrusive igneous rocks are formed when magma cools slowly beneath the Earth's surface. The slow cooling allows for the growth of large crystals, resulting in coarse-grained textures. Examples of intrusive igneous rocks include granite, diorite, and gabbro.
Reason for Option B:
The question asks about the rocks formed from molten magma. Sedimentary rocks are formed by the deposition and lithification of sediments, while metamorphic rocks are formed by the transformation of existing rocks through heat and pressure. Neither of these processes involves the solidification of magma. Therefore, the correct answer is option B, igneous rocks.
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The rocks formed from molten magma, are calleda)sedimentary rocksb)ign...
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