4b.2 - Deposition Processes and Landforms

Question 1

What do rivers deposit on a floodplain?

Answer 1

Any sediment that is too large to be carried

Question 2

Why do rivers deposit sediment on the floodplain?

Answer 2

Flooding - the river spreads out over the land either side

This increases friction, reduces energy, material is deposited

Question 3

When do rivers deposit sediment?

Answer 3

When they lose energy

Question 4

What sediment do rivers deposit where?

Answer 4

Larger material first (e.g. upstream / near the channel)

Smaller material last (e.g. downstream / further away)

Question 5

What are levees

Answer 5

Natural embankments either side of a river

Question 6

How do levees form?

Answer 6

During floods
Water and sediment come out out of the channel
Loss of velocity, deposition of sediment, heaver material first and nearer the channel

Question 7

Where do deltas form?

Answer 7

When the river reaches an ocean/lake and loses velocity

Question 8

How do deltas form?

Answer 8

Sediment is deposited in layers which build up in a fan

Smaller material travel the furthest