plate - one of the very large sections of hard, solid rock that makes up Earth's outer layer, trench - a long, deep indention in the ocean floor formed when two plates move into another, Cross section - a diagram that shows what the inside of something looks like, extinct - the complete disappearance of a species, Mesosaurus - an extinct reptile that lived 300 million years ago, Plate boundary - the place where two plates meet, Paleontologist - a scientist who specializes in the study of life forms that existed in previous geologic periods, crust - Earth's outermost layer of hard, solid rock that is underneath the soil, vegetation, and water, Core sample - a long narrow piece of rock obtained by drilling into a rock with a special tool that lifts out a part of the rock, Seismic Waves - a wave of energy that is generated by an earthquake or other earth vibration which travels within the earth or along its surface, Lithosphere - is made up of the crust and upper mantle and is broken up into moving tectonic plates that float on top of the mantle, Asthenosphere - below the lithosphere where the mantle is so hot that rocks flow and move in a cycle known as convection current,

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