The plates on Earth fit together like the pieces of a jigsaw puzzle., A giant landmass that existed over 250 million years ago., There are three main types of plate boundaries., When plates crash into each other, they can push up to form huge mountain., When plates slide past each other, they sometimes get stuck., When they finally move with a big jerk, it causes an earthquake., When plates pull away from each other, hot melted rock (magma) comes up to fill the space and makes new land, often under the ocean..

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