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Eruption
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There are almost no extrusive rocks on the earths surface because they are all under the earths surface. They are mainly lower than the earths surface.
This describes a volcano.
Eruption
The wave that can travel through earth and along earths surface is a SEISMIC wave.
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An earthquake is started when two plates (which lie under the Earths surface) rub together this creates movement which then sometimes pulls/pushes at the earths surface and creates giant cracks in the earths surface... and that is how an earthquake is started.
Vulcanicity is a process through which gaseous, liquid and solid materials are forced out of the earths crust to the earths surface. Volcanicity is the process where igneous materials reaches the earths surface from the earths crust to the earth surface
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Volcano or shield volcano.
Gravity.
Fumaroles are fissures through which water and water vapor escape from the Earth's surface.
the mantle