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volcanoes
volcanoes | |
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shield volcano | is it formed by thick lava flows. It has a gentle slope and not explosive. The largest volcanoes are shield volcanoes. |
composite volcano | it has large symmetrical cones. It is built by layers of magma, volcanic ash, cinders, and bombs. They have violent and explosive eruptions |
cinder cone volcano | it is a small cone-shaped volcano. They are very steep. blobs of lava spit out of the sides of the volcano. They can build over a short period of time. |
lava dome volcano | lava is too thick to travel a bog distance when the volcano is erupted. Then the lava cools which clogs the vents. |
dormant volcano | it is quiet now, but might erupt again |
extinct volcano | most likely not going to erupt again |
crater | a circular basin or depression |
volcanic ash | it is pieces of rocks, minerals, and volcanic glass |
subduction zone | composite volcanoes usually form at these. it is where oceanic plates go under continental plates, then magma rises to the top |
volcanic neck | it is solid magma that is stuck inside the volcano |
dike | they are called the veins of the volcano. they are pathways where magma/lava flows |
sill | it is a sheet between the old layers and the new layers of rock, lava, etc. |
caldera | a large basin-like depression resulting from the explosion or collapse of the center of a volcano |
mid-ocean ridge | it is an under water mountain range formed by plate tectonics |
rift valley | rift volcanoes form when magma rises into diverging boundaries |