state the thickness of the crust and the uppermost solid Mantle.
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The crust of the Earth is of two distinctive types:
oceanic: 5 km (3 mi) to 10 km (6 mi) thickand composed primarily of denser, more maflic rocks, such as basalt, diabase, and gabbro.continental: 30 km (20 mi) to 50 km (30 mi) thick and mostly composed of less dense, more felsicrocks, such as granite.
Because both continental and oceanic crust are less dense than the mantle below, both types of crust "float on mantle". This is isostasy, and it's also one of the reasons continental crust is higher than oceanic: continental is less dense and so "floats" higher. As a result, water pools in above the oceanic crust, forming the oceans.
oceanic: 5 km (3 mi) to 10 km (6 mi) thickand composed primarily of denser, more maflic rocks, such as basalt, diabase, and gabbro.continental: 30 km (20 mi) to 50 km (30 mi) thick and mostly composed of less dense, more felsicrocks, such as granite.
Because both continental and oceanic crust are less dense than the mantle below, both types of crust "float on mantle". This is isostasy, and it's also one of the reasons continental crust is higher than oceanic: continental is less dense and so "floats" higher. As a result, water pools in above the oceanic crust, forming the oceans.
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