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Across
1.the blocks of crust that is on the lithosphere
3.the ring of volcanoes around the Pacific Ocean
4.a wave that travels through the Earth
6.a seismic wave that causes a back-and-forth motion
7.a volcanically active area away from tectonic plate boundarys
9.the study of earthquakes
12.an opening in the crust that volcanic material passes through
13.makes up much of the pyroclastic material in an explosive eruption
14.the biggest part of the Mantle
15.the outermost layer of the Earth
Down
2.a hypothesis involving Pangaea
5.the most destructive type of seismic wave
8.the point above the focus
10.a break in a body of rock
11.type of lava that is jagged and brittle

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