The sliding down of a mass of earth or rock from a mountain or cliff.

The clearing of trees, transforming a forest into cleared land.

Rising ocean water along the coast, caused by hurricane winds pushing the ocean water higher as the hurricane approaches land.

The sudden occurrence of a violent discharge of steam and volcanic material.

An intense tropical storm with winds that exceed 119 km/hr that forms over warm, tropical water.

A sudden overflow of water that submerges land that is usually dry.

Any event or force of nature that has sudden, disastrous results

A sudden and violent shaking of the ground, sometimes causing great destruction, as a result of movements within the earth's crust.

A violent, whirling column of air in contact with the ground

The atmospheric conditions of a certain time in a certain place.

A period of below-average precipitation

An area of land that drains runoff into a particular stream, lake, ocean, or other body of water.

Any natural situation where groundwater flows from an aquifer to the Earth's surface.

A large area of land that has distinct groups of plants and animals.

An area of permeable sediment or rock that holds significant amounts of water.

An area of land that is saturated with water for part or all of the year

An effect on an environment resulting from human activity

Water that has less than 0.2% salt dissolved in it

The water that fills lakes and rivers

Water that is stored in cracks and pores in the Earth's surface

The laying down or settling of eroded material.

The measure of a rock's ability to hold water.

Water that flows over the Earth's surface

The long-term average weather conditions in a particular region

The measure of the ability of water to flow through rock and sediment

The process by which soil and rock is removed from one area of the earth through natural causes such as wind, water, and ice and transported elsewhere.

The process by which rocks are broken down into small grains and soil.