Rivers

Question 1

What are the 4 types of erosion

Answer 1

Hydraulic action, attrition, abrasion, solution

Question 2

What is hydraulic action

Answer 2

River banks have cracks and water gets in them. Air inside the cracks compress and it expands. Erosion happens and rocks break off.

Question 3

What is attrition

Answer 3

Two rocks smash together with force. The rocks break down into smaller and smoother rocks.

Question 4

What is abrasion

Answer 4

Rocks carried by the river scrape along the river bank eroding them through sandpaper affect.

Question 5

What is solution

Answer 5

River water have chemicals and is acidic meaning rocks can dissolve into the water

Question 6

What is the 4 types of transportation

Answer 6

Traction, suspension, saltation and solution

Question 7

What is traction

Answer 7

Big stones roll along the river because of the flow of the river but are to heavy to float

Question 8

What is saltation

Answer 8

Smaller rocks bounce on the river floor .

Question 9

What is suspension

Answer 9

Sediment size rocks is carried through the water. The float because they are so light

Question 10

How is a meander formed

Answer 10

Deposition on the inside bend occurs while erosion happens on the outside of the bend making the river curve

Question 11

What is the deposition area called

Answer 11

The river beach

Question 12

Where does the river flow faster and where slower in a meander

Answer 12

It flows slower on the inside of the bend and faster on the outside

Question 13

How does an oxbow lake form

Answer 13

1. the river starts to deposit and erode making it curve
2. on the outside channels they get closer to each other with eroding and the other side of the river is depositing making the river move and two bends come together
3. as the two bends come together, the neck of the meander is begining to disconnectfrom the main river
4. as it starts to disconnect the main river chooses the easier root to go through leaving behind the oxbow lake