Unit 1 Theme A Key Terms

The grinding of rock fragments carried by a river, against the bed and banks of the river.

• Attrition

• Abrasion

• Solution

• Hydraulic Action

A process of erosion where transported particles hit against each other, making the particles smaller and more rounded

• Hydraulic Action

• Abrasion

• Attrition

• Solution

The amount of water in a river which is passing a certain point at a certain time.

• Velocity

• Output

• Discharge

• Volume

The movement of waters into the soil from the Earth's surface.

• Infiltration

• Percolation

• Interception

• Surface Run Off

The process whereby precipitation is prevented from falling onto the ground by plants.

• Infiltration

• Interception

• Percolation

• Evapotranspiration

The movement of water from the soil into the bedrock

• Throughflow

• Groundwater Flow

• Infiltration

• Percolation

The bouncing of medium-sized load, like pebbles and small stones, along the river bed.

• Solution

• Traction

• Saltation

• Suspension

A stream which flows into a larger river.

• Confluence

• Watershed

• Offshoot

• Tributary

The boundary between drainage basins, often a ridge of high land.

• Watershed

• Source

• Mouth

• Confluence

Water which is moving horizontally through the bedrock towards a river or the sea.

• Throughflow

• Percolation

• Surface Run Off

• Groundwater Flow