Because it becomes less dense as it gets hotter. Less dense=lighter and therefore rises. Just like the wax in a lava lamp.
it is called magma.
it is called magma.
Ingenious rocks form when molten material under the earths surface cools. Not only does the molten cool it does not harden.
The molten rock material that flows over the earth's surface is known as magma. This is what will be emitted from a volcanic eruption.
Molten rock material on Earth's surface is called lava. When under Earth's surface it's called magma
crystals form when lava reaches the surface and cools
lava
lava
The molten material that reaches earth's surface is lava :)
Magma
pressure from the heat under the earths surface
Because the surrounding materials are nearly the same temperature as the molten rock material.