Ocean Floor Features

The arrow in the diagram below points to what oceanic feature?

What oceanic feature is the arrow pointing to?

Letter C in the diagram below shows the flat piece of the ocean floor. This is known as what?

The deepest part of the ocean floor; long and narrow is known as what?

Underwater mountain ranges; compared to mountains on land

The box in the diagram below shows which oceanic feature?

The indentation occurring along the top of the mid-ocean ridge is known as what?