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Study of plate tectonics and their movement

The study of past changes in the earth's magnetic field

As volcanoes erupt, magma which solidifies to form new rock, plates pull apart so rock is carried away and new younger rock is formed

Large or smaller slas of the earth's crust

Near the middle of the plate

An opening in a volcano

A crack in a volcano

Opening in the earth's crust where things such as gas and ash escape

Molten rock below earth's surface

Molten rock above the surface