geos and blowholes - erosional

Question 1

what are geos?

Answer 1

narrow, steep sided inlets

Question 2

what happens to weak points in geos?

Answer 2

weak points are eroded more rapidly by wave action than the more resistant rock around them e.g. joints and faults

Question 3

example of geo?

Answer 3

Huntsman’s leap Pembrokeshire
- 35m deep eroded along a large joint in limestone

Question 4

how are geos formed?

Answer 4

they are sometimes formed when the roofs of tunnel like caves collapse due to erosion. a partial roof collapse can lead to a blow hole forming - when the hold reaches down to the sea and aerated water comes to the surface during a storm

Question 5

how does hydraulic action affect geos?

Answer 5

forces air and water into joints weakening strata

Question 6

how are blowholes formed?

Answer 6

when the top of a tunnel-like cave collapses along a master joint in forms a vertical shaft

Question 7

example of blowhole?

Answer 7

trevone cornwall formed 25m deep blowhole

Question 8

what can geos and blowholes be associated with?

Answer 8

with mining shafts or the collapse of a cave roof