12 terms

Volcanoes-Unit Vocab Review

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caldera
a large crater at the top of a volcanic mountain
cinder cone
a type of volcano made up of layers of cinders with very steep sides
composite cone
a type of volcano with steep slopes near the top and gentle slopes near the base because of alternating layers of lava and rock; formed by the most explosive volcanoes
hot spots
extrememly hot places deep within the Earth's mantle that can form volcanoes in the middle of tectonic plates
island arcs
a chain of volcanoes; caused by colliding plates
lava
refers to the melted rock when it reaches Earth's surface
magma
melted rock within the Earth
rifting
a process of new sea floor or continental crust being formed at divergent boundaries
seismometer
an instrument that detects Earth's movements
shield cone
a type of volcano with gently sloping sides due to lava that quietly flows from the vent
tiltmeter
an instrument that measures any changes in the slope of an area
volcano
any opening in Earth's crust through which hot gases, rocks, and melted material erupt