Oceans are about four times as deep as mountains are high.At the bottom of the ocean are
A)towering mountains,deep valleys,and deep trenches near the continental borders.
B)thick layers of basaltic crust at mid-ocean ridges that gradually thin near deep ocean trenches.
C)towering plutonic mountains created from volcanoes and fissures at oceanic ridge areas.
D)all of these

Question

Quizplus · Accepted Answer

The bottom of the ocean is marked by deep trenches and valleys near the continental borders, as well as towering mountains. This is due to plate tectonics and the movement of the Earth's crust. The seabed is not a uniform level surface but rather has diverse topography, including underwater mountain ranges and deep canyons. Therefore, option A is the most accurate choice. Option B is incorrect because thick layers of basaltic crust are only found at mid-ocean ridges and do not cover the entire ocean floor. Option C is also incorrect because while there are volcanoes and fissures at oceanic ridge areas, these do not create towering plutonic mountains.

Oceans Are About Four Times as Deep as Mountains Are