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What is the thickness of the crust in oc...

What is the thickness of the crust in oceans, continents and mountains? (1) 40km and 6km (2) 70km and 10km (3) 90km and 15km (4) 100km and 25km

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The mean thickness of oceanic crust is 5 km whereas that of the continental is around 30 km. The continental crust is thicker in the areas of major mountain systems. It is as much as 70 km thick in the Himalayan region.
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