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Crossword Puzzle Chapter 9 Volcanoes

Across
A fissure eruption which covers the landscape like a flood
The smallest particles ejected by a volcano consisting of tiny fragments of glass that formed when liquid magma exploded into the air along with small pieces of volcanic rock and mineral
Forms over a long period of time as a sequence of lava flows and pyroclastic eruptions
A rock formed from a combination of hot gas, liquid magma, and solid rock fragments
Melting caused by decreasing pressure
A sheet-like. layer of igneous rock that flows between layers of country rock
Regular spaced and intersected five- or six-sided columns when viewed in cross section
After pyroclastic materials come to rest and the gas escapes the remaining materials
Is any large mass of intrusive igneous rock
When fissure eruptions occur in rapid succession, covering thousands of square kilometers
The process in which a rock is heated above the melting point, but does not melt
A hill for a mountain formed from lava, ash, and rock fragments ejected through a volcanic vent
A bowl-like depression at the summit of a volcano that was itself created by volcanic activity
Down
A gently sloping mountain formed from lava flows
When the roof of a magma chamber collapses leaving a circular depression
When an airborne column of ash, rock, and gas that falls back to Earth's surface and spreads out over the land and funneling downstream to valleys below
A process in which a silicate rock only partly melts and the composition of the magma is richer in silica than the original rock
A small volcano composed of pyroclastic fragments
A pluton exposed across more than 100 square kilometers
A volcanic fragment that vary in size from 4 to 32 millimeters
A volcanic opening
If lava solidifies before the gas escapes, the bubbles are preserved in the rock as holes