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Images 226 of 241 - Tectonic Plates
    Tectonic Plates
Volcanoes and earthquakes are more common in some parts of the world than others. The theory of plate tectonics says that the Earth's surface is fragmented into pieces. Tectonic plates move across the the Earth's surface in response to forces and movements within the planet. The plate boundaries, where plates collide, rub together or move apart, are areas of intense geological activity. Most volcanoes and earthquakes occur at these boundaries.