4.3 Flashcards
1
Q
Concordant?
A
Multiply types of resistant and non resistant rocks
2
Q
Discordant?
A
One type of resistant rock
3
Q
Formation of a stack: 1
A
Crack is opened up through hydraulic action.
4
Q
Formation of a stack: 2
A
The crack grows into a cave through continued hydraulic action and abrasion.
5
Q
Formation of a stack: 3
A
The cave erodes to form an arch.
6
Q
Formation of a stack: 4
A
The roof of the arch is eroded by chemical and biological processes.
7
Q
Formation of a stack: 5
A
The roof collapses and forms a stack, a single standing piece of rock.
8
Q
Formation of a stack: 6
A
The base of the stack is eroded to form a wave-cut notch leaving the rock unstable, it collapses to form a stump which is only visible at low tide.
9
Q
Difference between a spit and bar?
A
The prevailing winds doesn’t change
