WebQuest
Forces of Change on Earth
Evaluation
The Earth's surface is not completely solid. It has many large cracks in the surface at the edge of huge plates of rock called tectonic plates. The earth's crust can shift and slide at these cracks. When the tectonic plates move, it causes earthquakes. It can also cause volcanoes to erupt and mountains to form.
Two plates can push toward each other. This motion can cause mountains to grow, and volcanoes to form.
Two plates can pull apart from one another. Volcanoes can form, or magma can push up between the two plates.
Two plates can slide past each other. At this type of plate boundary, volcanoes do not form. The crust is cracked and earthquakes will shake the ground and crack it.
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