Rocks, Plate Tectonics & Earthquakes

What are the three main types of rock?

Igneous, sedimentary, and metamorphic

What type of rock forms from cooled and solidified magma or lava?

Igneous rock

What type of rock forms from compacted and cemented layers of sediment?

Sedimentary rock

What do we call the outermost, rigid layer of the Earth, broken into tectonic plates?

The crust (lithosphere)

What theory explains the movement of Earth's tectonic plates, which can cause earthquakes and volcanoes?

Plate tectonics