Question

1. the ocean floor looks much like the earths surface. there are plains, long mountain chains, and deep valleys. mid - ocean ridges connect to form a network of mountains _ km long. the mid - atlantic ridge is the longest section of this continuous mountain chain. 6000 30,000 65,000 13. many features of the ocean floor are results of tectonic plates being either pushed apart or colliding together. when a denser plate sinks below a less dense plate, subduction occurs. what develop at these subduction zones? mid - ocean ridges ocean trenches abyssal plains continental shelfs

Explanation:

1. Mid - ocean ridges form a network of mountains about 65,000 km long. This is a well - known geological fact about the ocean floor.
2. When a denser plate sinks below a less dense plate (subduction), ocean trenches develop at these subduction zones. This is due to the downward movement and deformation of the plates.

Answer:

1. C. 65,000
2. B. ocean trenches