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Molodets [167]
4 years ago
7

The continental crust is

Biology
2 answers:
7nadin3 [17]4 years ago
8 0
The continental crust is

A.composed mostly of granite
B.up to 6km thick
C.formed quickly -cooled lava
D.made of rock 2 million years old

i say the answer is D.
drek231 [11]4 years ago
8 0

Answer: Option (D)

Explanation: The continental crust is estimated to be about 2 billion years old measured by the U₂₃₈-Pb₂₀₆ dating method, whose life is about 4.5 billion years. It is comprised of about 55-60% of SiO₂ and 15-20% of AL₂O₃, and are comparatively less denser than the oceanic crust.

The density of the continental crust is about 2.85 g/cm³ and its thickness is about 35-40 km. In the mountain ranges like the Himalayas, its thickness ranges from about 40-80 km. The continental crust is created and destroyed due to the plate tectonic movement, thereby conserves the total crust of the earth.

Hence the correct answer is (D)

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Answer:

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Explanation:

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