Why do earthquakes and volcanoes occur along lines?

This is where the fault lines of the North American and Pacific plate meet, an areas where there is lots of earthquakes, tsunamies (caused by quakes) and volcanoes. Â Underneath these cracks in the Earth is magma (lava inside the earth), every once in a while, this magma will come to the surface and form volcanoes. And that is basically it.

Earthquakes and volcanoes occur along the edges of the plates. Over long periods of time. According to the theory, there are two types of plates, oceanic and continental.

Various types of movement occur along the different kinds of plate boundaries. When the plates move, they cause vibrations that produce earthquakes. Enough to be considered disasters.

Measures and records the intensity of earthquakes. Sensitive, they help scientists predict earthquakes, too. Build-up of stresses that lead to earthquakes.

Picture of the forces at work underground. To learn more about earthquakes, try the Volcanoes and Earthquakes Activity.

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