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What type of rocks are formed when molten lava cools down rapidly on the earth's surface?
- a)Sedimentary rocks
- b)Metamorphic rocks
- c)Intrusive igneous rocks
- d)Extrusive igneous rocks
Correct answer is option 'D'. Can you explain this answer?
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What type of rocks are formed when molten lava cools down rapidly on t...
- When fiery red molten lava comes out from the interior of the earth and cools down quickly on the earth's surface, it forms rocks called extrusive igneous rocks. These rocks have a very fine-grained structure. An example of extrusive igneous rock is basalt. So, when you see lava cooling fast and forming rocks like basalt, you're looking at extrusive igneous rocks.
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What type of rocks are formed when molten lava cools down rapidly on t...
Extrusive Igneous Rocks
Extrusive igneous rocks are formed when molten lava cools down rapidly on the earth's surface. This process results in the formation of fine-grained rocks due to the quick cooling of lava exposed to the air or water.
Formation Process
- When volcanic eruptions occur, lava is expelled onto the earth's surface.
- The lava cools rapidly, forming extrusive igneous rocks such as basalt, andesite, or rhyolite.
- This rapid cooling prevents the growth of large crystals, resulting in a fine-grained texture.
Characteristics
- Extrusive igneous rocks are typically dark in color due to their high iron and magnesium content.
- They often contain small cavities or vesicles formed by gas bubbles trapped in the lava during cooling.
- These rocks are commonly found on the Earth's surface in areas of past or present volcanic activity.
Examples
- Basalt is a common extrusive igneous rock found in oceanic crust and volcanic islands.
- Andesite is another extrusive igneous rock with a composition intermediate between basalt and rhyolite.
- Rhyolite is a light-colored extrusive rock with high silica content.
In conclusion, extrusive igneous rocks are formed when molten lava cools rapidly on the earth's surface, resulting in fine-grained textures and characteristic dark colors.
Extrusive igneous rocks are formed when molten lava cools down rapidly on the earth's surface. This process results in the formation of fine-grained rocks due to the quick cooling of lava exposed to the air or water.
Formation Process
- When volcanic eruptions occur, lava is expelled onto the earth's surface.
- The lava cools rapidly, forming extrusive igneous rocks such as basalt, andesite, or rhyolite.
- This rapid cooling prevents the growth of large crystals, resulting in a fine-grained texture.
Characteristics
- Extrusive igneous rocks are typically dark in color due to their high iron and magnesium content.
- They often contain small cavities or vesicles formed by gas bubbles trapped in the lava during cooling.
- These rocks are commonly found on the Earth's surface in areas of past or present volcanic activity.
Examples
- Basalt is a common extrusive igneous rock found in oceanic crust and volcanic islands.
- Andesite is another extrusive igneous rock with a composition intermediate between basalt and rhyolite.
- Rhyolite is a light-colored extrusive rock with high silica content.
In conclusion, extrusive igneous rocks are formed when molten lava cools rapidly on the earth's surface, resulting in fine-grained textures and characteristic dark colors.
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What type of rocks are formed when molten lava cools down rapidly on the earth's surface?a)Sedimentary rocksb)Metamorphic rocksc)Intrusive igneous rocksd)Extrusive igneous rocksCorrect answer is option 'D'. Can you explain this answer?
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What type of rocks are formed when molten lava cools down rapidly on the earth's surface?a)Sedimentary rocksb)Metamorphic rocksc)Intrusive igneous rocksd)Extrusive igneous rocksCorrect answer is option 'D'. Can you explain this answer? for Class 7 2024 is part of Class 7 preparation. The Question and answers have been prepared according to the Class 7 exam syllabus. Information about What type of rocks are formed when molten lava cools down rapidly on the earth's surface?a)Sedimentary rocksb)Metamorphic rocksc)Intrusive igneous rocksd)Extrusive igneous rocksCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 7 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What type of rocks are formed when molten lava cools down rapidly on the earth's surface?a)Sedimentary rocksb)Metamorphic rocksc)Intrusive igneous rocksd)Extrusive igneous rocksCorrect answer is option 'D'. Can you explain this answer?.
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