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2.large, basinlike depression resulting from the explosion or collapse of the center of a volcano.
5.the cup-shaped depression or cavity on the surface of the earth or other heavenly body marking the orifice of a volcano.
6.They are named for their large size and low profile
9.landmass that existed when all continents were joined
11.is a linear feature that exists between two tectonic plates that are moving away from each other.
12.formulated the idea that a supercontinent known as Pangaea
13.small, conical volcano built of ash and cinders.
1.large, steep volcano built up of alternating layers of lava and ash or cinders.
2.suture marking the juncture of lithospheric plates that have been joined by plate tectonics.
3.movement of continents
4.theory of global tectonics in which the lithosphere is divided into a number of crustal plates
7.volcanic material, as scoria, dust, etc., ejected during an eruption.
8.molten material beneath or within the earth's crust, from which igneous rock is formed.
10.a narrow opening produced by cleavage or separation of parts.

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