External Forces Of Earth

Question 1

What are examples of weathering?

Answer 1

Chemical weathering
Mechanical weathering
Mass movement

Question 2

What is chemical weathering?

Answer 2

Rocks are broken down when minerals change and occur because of chemical reactions in rocks. Undergoes change in chemical composition and predominant in humid or wet regions.

Question 3

What is carbonation?

Answer 3

Rain has co2
Dissolves in turning rain into weak carbonic acid
Acid water meets rocks which contain calcium carbonate
Chemical reaction

Question 4

What is oxidation?

Answer 4

Rocks contain iron
Metals rust and weaker
Have reddish iron-oxide color due to chemical weathering by oxidation

Question 5

Shat is mechanical weathering?

Answer 5

Due to temp differences
Rock is broken down without changing its chemical composition.
Predominant in hot dry regions and cold wet
Leading to slow formation of soils

Question 6

What is exfoliation?

Answer 6

Layers of rock peel off

Question 7

What is the heel of broken rocks called?

Answer 7

Scree

Question 8

What is granular disintegration?

Answer 8

Minerals with different levels of resistance
Softer minerals weather first
Rock surface covers with loose grains

Question 9

What is ice shattering?

Answer 9

Cold wet climate
Water fills cracks in rock and freezes and expands
Melts next day
Freeze thaw action cracks rock
Sharp

Question 10

What is joint cracking?

Answer 10

Rocks join
Water seeps in
Causes wedging action in joint
Heat causes expansion and cooling occurs which means contraption
Cracks appear horizontally and vertically

Question 11

What is biological weathering?

Answer 11

Decomposing plant materials makes rain water acidic
Miss or lichen trains rainwater
Roots fooling force joints in rock apart, rain water dissolves minerals means more acidic

Question 12

What is weathering?

Answer 12

Rocks of esrth are broken down into small parts making soil