Rock Types

Question 1

Differential erosion

Answer 1

Different rates of erosion

Question 2

Igneous rock

Answer 2

Crystalline (Crystal interlock) - no pore spaces (less infiltration + less erosion)
Pervious - water can pass through if there’s cracks

Question 3

Sedimentary rock

Answer 3

Clastic (particles compressed together)

Porous - since water can infiltrate into pore spaces

Question 4

Dependent on age

Answer 4

Sedimentary - older means more compressed (more resistant and less porous)
Igneous - older means more cracks (more pervious)

Question 5

Permeability

Answer 5

Groundwater weakens rocks by exploiting joints/faults

Less stability

Question 6

Unconsolidated material

Answer 6

Material that is not together (loose)

Weakest and most easily eroded

Question 7

North Antrim Coast, NI

History

Answer 7

Volcanism - igneous rock
Preserved soft sedimentary rock under shallow ocean
Covered by ice sheet during Quarternary

Question 8

North Antrim Coast, NI

Answer 8

Resistant since mostly igneous bedrock
Resistant to erosive forces - (e.g: Portrush Headland)
High energy env since exposed to Atlantic