Which of the following statements regarding Earth's internal structure is/are correct?
1. The oceanic crust is heavier than the continental crust.
2. Most of the Earth's internal heat is contained within the mantle.
3. Large convective cells in the crust circulate heat and drive plate-tectonic processes.
Select the answer using the code given below :
- A
3 only
- B
1 and 2 only
- C
2 and 3 only
- D
1, 2 and 3
✓ Correct answer: B
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