A wall stands using gravity. It is constantly being pulled down. Many also place them in ways that they dig into the ground, and almost make a socket just for the wall to be placed, using the land that is there. More and more walls are placed and eventually, they make flooring and a roof.
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Answer:
B. the Appalachian Mountains and the Laurentian Mountains
how a mineral reflects light from its surface is known as: luster
