Causes+(before)

1179419586 - myrna gonzalez period1 Volcanoes form when magma ( liquid rock inside the earth ) reaches the surfce. Depending on the type and durationn of the eruption lava and/or tephra can pile up to make a volcano. This happens when two tectonic plates meet and one goes under the other. Then magma comes up through the vent and that makes the volcanoe erupt. Once it has erupted, the magma is called lava. So the cuases of volcanoes are the tectonic plates subducting.

1178216489 Volcanoes are caused When too much pressure has built up. It will sometimes ooze out but other times it burst like a cannon. When it oozes people have time escape. When it bursts it will kill almost everything just like Pompei.

1178217354Stephanie Preciado period3 Volcanoes are all around the world. They cause when the magma pressue builds up.Then the lava comes out and cools or it goes all around. Volcanoes can happen anywhere when the magma builds up and the lava is very deadly and maby people die from volcanoe eruptions every year. Volcanoes can also help cause many other natural disaters like tsunami's and sometimes earthquakes.



1178247871 Volcanoes erupt when two plates push together and one plate slides beneath the other. This is what is called a subduction zone.When the plate is under is deep enough the mantle some rock on the plate melts and forms magma that can move up and erupt at the Earth's surface. - Alma R. Period 1