Answer:
Corroded metal
Explanation:
Acid rain damages buildings and structures because it dissolves the stone or corrodes the metal that is exposed to the weather.
Align perpendicular to the plane in which the maximum compressive stress in applied, as the space in the rock is reduced.
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The geography of the United States impacts the possible regions people settle in.
Areas that tend to be flat (or small amounts of small hills) tend to be the most population areas because it is easier to build houses, apartments, etc etc. However there is very few places people have settled where National Parks and Mountains are located because it is unstable and extremely difficult to make a house in that region.
