Education | Educational Programs | The Rock & Mineral
The Inside Scoop on the Earth
The Earth is a ball of
rock 7,927 miles in diameter. The inner core is very dense, heavy and tremendously
hot. The heat melts the mantel rock, as the molten rock rises it cools and hardens
and then sinks to be remelted again and again. This constant process of heating
and cooling rock creates movement in the Earth crust. The rock becomes lighter
and less dense as it nears the surface.