coast Flashcards
1
Q
Caves, arches, stacks and stumps
A
- Cracks are formed in the headland through the erosion al processes of hydraulic action and abrasion.
- As the waves continue to grind away at the crack, it begins to open up to form a cave.
- The cave becomes larger and eventually breaks through the headland to form an arch
- The base of the arch continually becomes wider through further erosion, until its roof becomes too heavy and collapses into the sea. This leaves a stack.
- The stack is undercut at the base until it collapses to form a stump
2
Q
mechanical weathering
A
Mechanical weathering (Freeze thaw)
- Water enters cracks in the rock.
- When temperature drop, the water freezes and expands causing the crack to widen
- The ice melts and water makes its way deeper into the cracks.
- The process then repeats until the rock cracks