essay part 2 Flashcards
At a constructive plate boundary…
faults occur when plates slide. Eg. San Andreas at Pacific and N.American plate boundaries.
When the rocks…
are pulled apart due to tension they split.These cracks are faults.
When several faults occur…
parallel to each other, land between them can move up if compression has occurred or down if tension is occurring.
A rift valley forms…
when stretching of the crust causes the land between parallel faults to sink. This forms a flat-floored valley with steep side.
The slopes…
mark the fault lines-escarpments.
In the African rift valley…
stretching and faulting of the crust occurs at a hotspot of magma rising under the crust.
This rift valley…
is over 5.000km long. The edges of it are marked by escarpments running from Ethiopia to Mozambique.
Block mountains…
form when crust is compressed- Ox mans.
