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Which of these rocks make up for large portions of the crust of Earth?
1. Granitic rocks
2. Basaltic rocks
3. Pumice rocks
4. Obsidian rocks
Choose the correct answer from the following codes:
  • a)
    2 and 3 only
  • b)
    1 and 2 only
  • c)
    1, 3 and 4 only
  • d)
    All of the above
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Which of these rocks make up for large portions of the crust of Earth...
Answer:

Rocks That Make Up the Crust of Earth

The crust of the Earth is made up of various types of rocks, but some of them make up for large portions of it. These rocks are:

1. Granitic rocks
2. Basaltic rocks

Explanation:

Granitic rocks are igneous rocks that are light-colored and have a coarse-grained texture. They are formed from the slow cooling of magma beneath the Earth's surface. They are found in the continental crust and make up a large portion of it.

Basaltic rocks, on the other hand, are dark-colored igneous rocks that have a fine-grained texture. They are formed from the rapid cooling of lava on the Earth's surface. They are found in the oceanic crust and make up a significant portion of it.

Pumice rocks and obsidian rocks are also types of igneous rocks, but they do not make up large portions of the Earth's crust. Pumice rocks are formed from the rapid cooling of lava that is rich in gas bubbles, while obsidian rocks are formed from the rapid cooling of lava that is rich in silica.

Conclusion:

Therefore, the correct answer to this question is option 'B' - 1 and 2 only, as granitic rocks and basaltic rocks make up for large portions of the Earth's crust.
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Which of these rocks make up for large portions of the crust of Earth...
B
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Which of these rocks make up for large portions of the crust of Earth?1. Granitic rocks2. Basaltic rocks3. Pumice rocks4. Obsidian rocksChoose the correct answer from the following codes:a) 2 and 3 onlyb) 1 and 2 onlyc) 1, 3 and 4 onlyd) All of the aboveCorrect answer is option 'B'. Can you explain this answer?
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