Lithology

Question 1

What is lithology

Answer 1

Type of rock

Question 2

What are the three types of rock

Answer 2

Igneous
Metamorphic
Sedimentary

Question 3

Example of igneous rock

Answer 3

Granite

Question 4

Example of metamorphic rock

Answer 4

Marble or slate

Question 5

Example of sedimentary rock

Answer 5

Sandstone or limestone

Question 6

Erosion rate and explanation of igneous rocks

Answer 6

Very slow <1mm per year
Crystalline rocks where the interlocking crystals make strong and hard erosion resistant rock
Have few joints so limited weaknesses

Question 7

Erosion rate and explanation of metamorphic rock

Answer 7

Slow 1mm-10cm per year
Resistant to erosion
Foliation where crystals are all orienated in one direction which produces weaknesses
Often folded and heavily fractured which are weaknesses that erosion exploit

Question 8

Erosion rate and explanation of sedimentary rock

Answer 8

10cm to several metres per year
Clastic and erode faster
Younger rocks so tend to be weaker
Many bedding places and fractures which ate most vulnerable to erosion