The probable reason for the case would be that the sea floor 200 million years ago is now above the sea level.
The ocean floor is the eventual recycling center. While the Earth's continental crust can prevail for billions of years, the movement of tectonic plates results in subduction, that is when the crust of the ocean is pushed down into the present mantle. So, the ocean floor hardly endures longer than 200 million years.
Answer:
Satellite or space shuttle but im pretty sure satellite
Explanation:
The real difference between a cotyledon and the true leaves of flowering plants is the fact that a cotyledon is a kind of seed that is being produced by all plants for reproduction while the true leaves of flowering plants are parts of photosynthesis.
Answer:
Middle layer, density increases with depth as pressure increases.
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