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6.a hypothetical continent including all the landmass of the earth
7.a divergent boundary or divergent plate boundary is a linear feature that exists between two tectonic plates (2 Words)
9.A volcanic crater is a circular depression in the ground caused by volcanic activity.
13.A caldera is a cauldron-like volcanic feature usually formed by the collapse of land following a volcanic eruption
14.is fragmental material produced by a volcanic eruption regardless of composition, fragment size or emplacement mechanism.
15.the gradual movement of the continents across the earth's surface through geological time. (2 Words)
1.In plate tectonics, a convergent boundary, also known as a destructive plate boundary, (2 Words)
2.hot molten or semifluid rock erupted from a volcano or fissure, or solid rock resulting from cooling of this.
3.a theory explaining the structure of the earth's crust (2 Words)
4.long, narrow opening or line of breakage made by cracking or splitting, esp. in rock or earth.
5.a cone formed around a volcanic vent by fragments of lava thrown out during eruptions. (2 Words)
8.a volcano built up of alternate layers of lava and ash.
10.hot fluid or semifluid material below or within the earth's crust from which lava and other igneous rock is formed by cooling.
11.German meteorologist and geophysicist: originated theory of continental drift.
12.a broad, domed volcano with gently sloping sides, characteristic of the eruption of fluid, basaltic lava.

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