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Figure 4.5. A flood plain
Hills are elevations of the earth's surface that have distinct
summits, but are lower in elevation than mountains. Hills may be
formed by a buildup of rock debris or sand deposited by glaciers and
wind. Hills may be created by faults. Hills are formed when these
faults go slightly upward. Hills are also formed by deep erosion of
areas that were raised by disturbances in the Earth’s crust. Erosion
forms hills by carrying away all of the soil on a mountain, causing a
hill to be left behind. Humans also make hills by digging soil up and
dumping it in a giant pile. Volcanoes are also another way that hills
are formed. Volcanoes form hills when they erupt.
Fault is a slight crack in the Earth which can cause earthquakes.
Figure 4.6. Loess
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