2.1 - Rock Types and Erosion

Question 1

What are I genius rocks?

Answer 1

Crystalline rocks which have interlocking crystals that make it strong and resistant to erosion
Often have few joints
Erode very slowly

Question 2

Examples of igneous rock?

Answer 2

Granite

Basalt

Question 3

What is metamorphic rock?

Answer 3

Rock that’s been modified by extreme heat and pressure and has many folds and decompressed layers so has many fractures
Erodes slowly

Question 4

Examples of metamorphic rock are

Answer 4

Marble

Slate

Question 5

What is sedimentary rock?

Answer 5

Clastic rock formed by compressed skeletons and shells of dead and decayed organisms and contain many fractures
Erodes very quickly

Question 6

Examples of sedimentary rock sre

Answer 6

Limestone
Chalk
Shale

Question 7

What is columnar jointing?

Answer 7

Lava contracting as it cools forms cracks which grow downwards to form columns
In basalt mainly

Question 8

Difference between intrusive and extrusive rock

Answer 8

Extrusive has hot magma cooled on top of the rock - fine crystals
Instructive has magma cooled underground - large crystals