Deltas

Question 1

Define delta

Answer 1

Deltas are deposited landforms found at the mouth of a river where the river meets a body of water with a lower velocity than the river

Question 2

Delays form under what conditions

Answer 2

When the rate of deposition exceeds the rate of erosion. ie when a river has a large amount of sediment

Question 3

Another condition

Answer 3

Flocculation when freshwater mixes with sea water chemical reactions with the salt cause clay particles to coagulate, increasing weight and depositional rates.

Question 4

Delta characteristics

Answer 4

As the sediment leaves the river mouth it tends to be deposited in three layers topset, forest and bottomset beds. As the water carries its sediment heavier particles are deposited first and lighter last and are carried further out

Question 5

Arcutate delta

Answer 5

Has a curved outer edge
Sediments deposited over 1000s if years
Eg Nile

Question 6

Birdfoot

Answer 6

Created when a river with a huge sediment load into a shallow, low energy waters
Sediment is deposited along channel sides and additional channels also extend and so the birds foot shape is created.
Eg Mississippi