Question

The base of plains, mountains and ocean beds is composed of

Answer 1

Answer:

Explanation:

The topography or surface area of the world's continents varies greatly, with features ranging from mountains and other highland areas to plunging canyons and low-lying basins. Despite this diversity of landforms, certain large-scale features are common to all continents. Generally, the continents contain vast interior plains that make up over 50 percent of their landscape. Plains are also found along certain coasts of continents and on the ocean floor.

Plains may seem common and unremarkable, lacking the grand character of mountains or the mysteriousness of caves. Yet these normally flat landforms have a rich geological history, offering an insight into the forces that have helped shape the surface of the planet.

Read more: http://www.scienceclarified.com/landforms/Ocean-Basins-to-Volcanoes/Plain.html#ixzz6AjnhzjFU

Answer 2

Answer:

igneous rocks.

Explanation:

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