weathering Flashcards
1
Q
What is weatheing
A
The breaking down of rocks
2
Q
Physical weathering
A
No chemical chnage. Abrasive action of water and detritus. Wind + glaciers
3
Q
Chemical weathering
A
Solution and carbonation. Causes rock to decompose chemcially.
4
Q
Examples of physcial weathering
A
- Temperature change (expansion and contraction).
- action of ice
- biological acivity
5
Q
Examples of chemical weathering
A
Oxidation: water and rocks form iron oxide
Hydrolysis: acidic groundwater and silicate minerals form clay
6
Q
Weathering is controlled by
A
ROCK TYPE
7
Q
How do igneous rocks chemically weather
A
Minerals chemically weather in order of crystallisation
8
Q
Fine grain =
A
Weathers easier
9
Q
How does EROSION move rocks
A
Moves weathered rocks by: Gravity Running water Wind Glaciers Sea currents
10
Q
Erosion is ….
A
Deposited elsewhere as sediments
11
Q
What is soil
A
Reaidue from chemical weathering deposited as sediments.
