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Some volcanoes form new ___________ as plates move apart and magma rises to the surface of the crust.
Scientist can __________ earthquakes by using seismographs, the Mercalli scale, and the Richter scale.
California has more than 20,000 earthquakes each year, because there is a large ___________ running through the state.
All eruptions _______ form the same kinds of volcanic mountains because the shape of a volcano depends on what type of materials it erupts. There are different eruptions for different volcanoes.
Earth's plates move very slowly across Earth's surface on a thin layer of partly melted _________.
The 1964 Alaska earthquake released more energy than the 1989 California earthquake as measured by the ____________ (size of waves) and the intensity using a Richter scale.
If Earth's plates stopped moving, then the Earth's core would cool and no new mountains would form. Then rain would erode the Earth's surface until it was flat and covered with water.
Ring of Fire
The _____________ is an area with frequent earthquakes and volcanic eruptions that circles the Pacific Ocean.
________ is the point on the surface of Earth that is right above the focus of an earthquake.
________ is a mountain that forms when red-hot melted rock flows through a crack onto Earth's surface.
_______ is the Earth's outer layer and includes the rock of the ocean floor and large areas of land.
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