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Q: The floor of heavier rock under the oceans is composed of?
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What are Mountain Chains On The Oceans' Floor called?

mid-ocean ridges tey are under water.


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What makes the crust unique is that it is the rigid, rocky outer surface of the Earth, composed mostly of thinner under the oceans.


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The earth consists of several different and distinct layers. The three main layers are the core, the mantle and the crust. The core is the inner part of the earth, the crust is the outer part and between them is the mantle. Knowledge of earth's interior is essential for understanding plate tectonics. The Earth is made of many layers. The deeper layers are composed of heavier materials; they are hotter, denser and under much greater pressure than the outer layers. The Earth's surface is composed mostly of water, basalt and granite. Oceans cover about 70% of Earth's surface. These oceans are up to 3.7 km deep.


Which layer is the thinnest under the oceans and thickest in the mountains?

The Earth's crust is thinnest under the oceans and thickest in the mountains.


Which layer is the thinnest under the oceans and the thickest in the mountains?

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