Mass movement is the bulk movement of rock and soil debris down a slope in response to gravity or the sinking of the Earth's surface in a vertical direction. This process may also be referred to as mass wasting. More »

Mass movement refers to the relocation of surface material resulting from gravity. The most common types of mass movement are landslides and rockfalls; these types of movements are very sudden. Other forms of mass moveme... More »

Mass movement, or mass wasting, has significant effects on humans, including loss of property, severe injury and death. This has become a larger problem as the human population grows and people have spread over more prev... More »

A creep is the slow, downward movement of soil or debris. One factor thought to contribute to a creep is heaving. Heaving is the expansion and contraction of rock fragments during wet and dry cycles. More »

Groundwater is the water that is in the cracks and spaces between sand, soil and rock underground, and it sometimes bubbles up to the surface through springs. It is naturally replenished by rain and melting snow that see... More » Science Earth Science

If the Earth were to suddenly stop spinning, it would be the high winds, rather than gravity, that would immediately remove all traces of life from the Earth's surface. Thankfully, there is virtually no chance of the Ear... More » Science Earth Science

The geothermal gradient is the gradual warming of layers of rock relative to their distance from the Earth's surface. The average geothermal gradient is an increase of 1 degree Celsius for each 40 meters of depth. More » Science Earth Science