What is sea floor spreading?
Why does the ocean floor slope down?
What is the deepest part of the ocean floor?
Where are the youngest types of rocks located on the ocean floor?
Is it true that sand piles up on the bottom of the ocean only 1 centimeter every 1000 years?
What are beaches?
How do islands form?
Is the Atlantic Ocean growing?
How are beaches made?
Can you tell me about the Challenger Deep?
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