UNIT

8Surface process

Biology and Geology 3. Secondary Education

SEDIMENTARY BASINS

UNIT

3

Biology and Geology 3. Secondary Education

UNIT

8Sedimentary basins

A sedimentary basin is an area of the earth’s crust that has been subjected to progressive sinking, and where sediments from the erosion of the rocks around it accumulate.

Erosion

Basin

Accumulated layers of sediment on the bottom of the basin

Erosion

Sinking

UNIT

3

Biology and Geology 3. Secondary Education

UNIT

8Sedimentary basins

Sedimentary basins can be found in different parts of the earth’s crust. For example:

In the interior of continental areas.They occupy low areas where river courses generally flow, or where there are lakes and lagoons. The streams flowing down the slopes

also deposit sediment in them.

UNIT

3

Biology and Geology 3. Secondary Education

UNIT

8Sedimentary basins

Sedimentary basins can be found in different parts of the earth’s crust. For example:

In coastal areas.They occupy the areas where major rivers flow into the sea. When

these basins are filled in, they usually form swamps or deltas.