The Earth's surface is home to spectacular and frightening sights and experiences that hint at what is happening deep within the planet. Volcanoes andearthquakes are powerful evidence of the tectonic plates that grind against one another and the magma that rises through an inner layer known as the mantle.
Plate tectonics, a theory central to modern geology, explains so much of what we see happening around us. Through this theory, we now understand how mountains form, why there are different types of volcano, and how the land surface is constantly renewed.
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