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Unit 7.2A Volcanoes

Volcano NSGG standards

QuestionAnswer
When molten material crystalizes into solid rock the energy transfers from the Earth's interior to the surface
On a spreading ridge environment the newest rock is closest to the opening and the oldest rock is the furthest away.
matter and energy at a spreading ridge occurs in the process as molten rock flows from the mantle to the crust, it cools and crystallizes to form new rock at the center of the fissure volcano.
the pattern of rock ages on either side of the spreading ridge is caused by new volcanic activity that fills the center of the ridge, pushing the older rock outwards. As this process repeats over time, the oldest rock is always pushed further from the ridge, and the newest rock is formed right over the ridge.
evidence of plate motion in a spreading ridge If the plates were NOT moving apart, the lava flows would pile on top of each other, and the oldest rock would be covered by newer rock, rather than the farthest from the plate boundary.)
hotspot volcanoes are caused by the motion of a plate over a fixed hotspot in the mantle
Hotspot volcanoes form when A hot spot in the mantle causes the ocean crust above it to melt.Energy from the mantle melts the crust above into magma. Magma rises up through the crust, erupts onto the surface (as lava), losing energy to the atmosphere and crystallizing.
subduction downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate
Scientific Principle that is agreed upon by scientist about hotspots Oceanic crust sinks into the hot mantle and is melted into magma which rises up through continental crust and forms volcanoes.
Tectonic Plates move in three ways: divergent, convergent, and transform. They can also subduct under one another.
Hotspot volcanoes are caused by the motion of a plate over a fixed hotspot in the mantle
Created by: crumsey
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