Convection occurs when heat rises which changes the density of a fluid or semisolid substance.

Name: Convection occurs when heat rises which changes the density of a fluid or semisolid substance.
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The convection that occurs within the Earth begins in the asthenosphere and mantle. The heat rises as it makes the liquid or semisolid around it less dense. The less dense portion then rises to the surface. Information can be found in the section A New Understanding of Earth Evolved Slowly.

Convection Occurs When Heat Rises Which Changes the Density of a Fluid