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8Surface process

Biology and Geology 3. Secondary Education

SEDIMENTA! BASINS

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3

Biology and Geology 3. Secondary Education

UNIT

8Sedi"entary #asins

A sedimentary basin is an area of the earths crust that has been

subjected to progressive sinking, and where sediments from the erosion

of the rocks around it accumulate.

Erosion

Basin

Accu"ulated

layers of

sedi"ent on

t$e #otto" oft$e #asin

Erosion

Sin%ing

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3

Biology and Geology 3. Secondary Education

UNIT

8Sedi"entary #asins

Sedimentary basins can be found in different parts of the earths crust.

For example

In t$e interior of continental areas.

!hey occupy low areas where river courses generally flow, or where

there are lakes and lagoons. !he streams flowing down the slopes

also deposit sediment in them.

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3

Biology and Geology 3. Secondary Education

UNIT

8Sedi"entary #asins

Sedimentary basins can be found in different parts of the earths

crust. For example

In coastal areas.

!hey occupy the areas where major rivers flow into the sea. "hen

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