Y10 Rivers and Coasts 10/7/20

Backwash is the...

• Gunk left after someone has some of your drink

• The movement of water back down the beach at a 90 degree angle.

This type of weathering occurs when rocks weaken then break down due to chemical changes in the composition of the rock.

• mechanical weathering
• chemical weathering
• erosion weathering
• deposition

These gravestones have slowly broken down and turned a blackish color due to the action of:

• ice wedging
• abrasion
• acid rain
• mechanical weathering

How does freezing water cause the weathering of rocks?  The freezing water—

• keeps the rocks in place.
• makes the rocks last longer.
• expands cracks and breaks rocks.
• causes rocks to fall in landslides.

How do plants weather rocks?

• During photosynthesis
• When roots grow into cracks of rocks and expand the rock breaks.
• When the plant moves water from the roots to the leaves, the rock breaks.
• Plants don't weather rocks.

What factors affect the size of waves?

• Strength of wind

• How long the wind has been blowing for

• The fetch. (The distance of ocean over which the wind blows)

• The amount of rainfall

What do constructive waves do to the amount of sediment on the beach?

• The build the beach up (construct it)

• The remove beach sediment (destruct it)

Which type of wave has a high wave frequency?

• Constructive

• Destructive

Which type of wave creates a narrow steep beach??

• Constructive

• Destructive

The movement of material downslope due to gravity is known as

• weathering

• erosion

• mass movement

• the coast