| Consider the following statements regarding the Earth's crust. |
| 1. The thickness of the Earth's crust is uniform, but the density of the Earth's crust is variable. |
| 2. Continental crust is composed mostly of granite whereas oceanic crust consists of a volcanic rock called basalt. |
| 3. Density of mountain areas is less than the mean density of material in oceanic crust. |
| Which of the statements] given above is/are correct? |
A) Only 2
B) 2 and 3
C) 1 and 2
D) All of these
Correct Answer: A
Solution :
[a] Statement 1 is incorrect as, both thickness as well as density of the crust are variable. They are more in continental crust than in oceanic crust. Statement 2 is correct. Statement 3 is also incorrect. The density of rocks (in continental crust) is more than the density of oceanic crust. (Oceanic crust density\[2.7g/c{{m}^{3}}\]) (Continental crust density\[3g/c{{m}^{3}}\])
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