Consider the following statements regarding the earth rsquo s crust 1 The thickness o...........

Geography Earth Geology

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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 lava rock called basalt

Which of the statements given above is/are correct?

1 only

2 only

Both 1 and 2

Neither 1 nor 2

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Explanation:

First statement is incorrect as the crust is about 3-5 miles (8 kilometers) thick under the oceans(oceanic crust) and about 25 miles (32 kilometers) thick under the continents (continental crust).

Second statement is correct as the crust is composed of two basic rock types granite and basalt. The continental crust is composed mostly of granite. The oceanic crust consists of a volcanic lava rock called basalt.