The correct answer is: The ocean floor contains tall mountains and deep canyons.
When scientists first mapped the ocean floor, they were surprised to discover that the ocean floor was not a smooth, flat plain as they had previously thought. Instead, they found tall mountains, deep canyons, and other geological features that were previously unknown. This led to a better understanding of plate tectonics and the formation of the Earth's crust.
What surprised scientists when they first mapped the ocean floor?
The ocean’s islands are floating on the surface of the water.
The ocean is a smooth, flat plain from one continent to the other.
The ocean floor contains tall mountains and deep canyons.
The ocean floor is almost totally covered in vegetation.
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