Once it reaches the surface of the planet (at which point it is known as lava), molten rock may flow up to 30 miles per hour. It is basalt lava, containing little silica, which can travel at 10-30 miles per hour. Andesite and dactite lava, which has more silica, moves slower and not very far from the point of eruption.
Magma is the name for lava once it has reached a cooled temperature. Lava moves rather slowly at about 4-5 yards a minute. Magma once cooled only moves about 2 yards a minute. This depends of course on the land over which the magma is moving. Magma inside the earth, however, does not flow, rather it simply moves around due to its light weight.
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