Movements within the earth's interior cause earthquakes. To us, the earth's
crust appears to be fixed and stable. But there is convincing scientific
evidence that it is in constant motion. The movement is so small that
we cannot even feel it. But when this movement causes a sudden slip or
a collision of two parts of the crust, the result is an earthquake. When
we looked into the internal structure of the earth we learned about its
various layers. The layer below the crust is the lithosphere. The entire
lithosphere is always in constant motion. As it moves, the continents
split and drift thousands of kilometres across the earth's surface. The
motion is too small for us to feel or see. But over the millennia, the
landmass of the earth has broken apart and rejoined in many shapes.
(It may take few seconds for the sound to get loaded!
Please wait!)
