The ____ is the outermost layer of the Earth. The Earth has four ____. The ____ is between the crust and the core. Earth's crust is made up of interlocking pieces called ____. A ____ boundary is where two tectonic plates crash into each other. ____ developed the theory of continental drift? The ____ system contains all of the water in the oceans, freshwater in streams and lakes, and the snow and rain. All fossils are ____. From fossils, we can figure out ____.

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