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Lesson · Grade 3 · Science

Erosion and Deposition: How Wind, Water and Ice Move Land

  • Grade 3
  • Science
  • 1 min 11 s
  • British Columbia
  • BC3-SC-13

One side view of a mountain, a river, a lake and a sandy beach builds up step by step: a river carries mud and sand downhill, the wind blows sand off the beach, and a glacier scrapes up rocks, which is erosion. Then the same pieces are dropped somewhere new, which is deposition: the river slows in the lake and builds a delta, the slower wind piles up a dune, and the melting glacier leaves its rocks behind, with a close look at the tiny deltas children can find in puddles after rain.

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In one sentence

The question this lesson answers

How can wind, water and ice move land?

Here is a mountain, a river, a lake and a sandy beach.

Transcript

What the lesson says

How can wind, water and ice move land?

Here is a mountain, a river, a lake and a sandy beach.

Erosion is when rock and soil are carried away.

A river carries mud and sand downhill.

Wind picks up dry sand and blows it away.

A glacier is a huge mass of ice that moves slowly downhill.

As it moves, it scrapes up rocks and carries them along.

Deposition is when rock and soil are dropped somewhere new.

In the lake, the river slows down and drops its mud and sand.

The mud and sand pile up into new land called a delta.

When the wind slows down, it drops the sand in a hill called a dune.

When the glacier melts, it leaves its rocks behind.

After rain, you may see tiny deltas where little streams run into puddles.

Erosion carries rock and soil away, and deposition drops it somewhere new.

Curriculum

Where this fits

British Columbia, Grade 3

Science, Earth science: observable changes in the local environment caused by erosion and deposition by wind, water, and iceBC3-SC-13

Previous: Landforms: the shapes of the land

The outcomes and strands follow the British Columbia curriculum.

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