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9th Grade Earth Science~Chapter 18 Crossword Puzzle

Jackson/Freeland

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Across
4.opening in earths crust through which lava erupts and flows out onto the surface
7.bowl shaped depression usually less than 1 km in diameter, that forms around the central vent at the summit of the volcano.
9.large crater, up to 50 km in diameter that can form when the summit or side of a volcano collapses into the magma chamber
10.large sloping volcano built by violent eruptions of volcanic fragments and lava that accumulate in alternating layers
12.broad volcano with gently sloping sides built by non explosive eruptions of basaltic lava that accumulates in alyers
13.pluton that forms when magma intrudes parallel rock layers
15.course grained irregularly shaped igneous rock mass that covers at least 100km2, generally forms 10-30 km below Earth's surface , and is common in the interior of major mountains chains
16.Intrusive igneous rock bodies including batholiths, stock sills and dikes formed through mountain-building processes and aceanic collisions; can be exposed at Earths surface due to uplift and erosion.
Down
1.steep-sided, generally small volcano that is built by the accumulation of tephra around the vent
2.rock fragments classified by size that are thrown into the air during a volcanic eruption and fall to the ground
3.irregularly shaped pluton that is similar to batholith but smaller, generally forms 10-30 km beneath earths surface, and cuts across older rocks
5.swift moving potentially deadly clouds of gas, ash, and other volcanic material produced by a volcanic eruption
6.unusually hot area in Earths mantle that is stationary for long periods of time, where high temperature plumes of mantle material rise toward the surface
8.relatively small, mushroom shaped pluton that forms when magma intrudes into parrellel rock layers close to earths surface
11.A substances internal resistance to flow
14.pluton the cuts across pre-existing rocks and often forms when magma invades cracks in surrounding bodies

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