Layers of lava build up over time, creating volcanoes. Tectonic plates are key. They are large pieces of the Earth’s crust which can move towards, away from, or alongside one another ...

CONNOR: The surface of the Earth is called the crust and it is made up of different plates, pieces that fit together and float about on a layer of ... surface causing a volcanic eruption.

A massive volcanic eruption can propel sulfur dioxide through the troposphere — the part of the atmosphere where weather happens — and into the stratosphere, the layer about 7 miles above the ...