What is isostasy?
The balancing downward force of the crust and the
upward force of the mantle.
How does a dome form?
Magma works its way up to the earth’s surface
without actually breaking through or erupting,
causing the earth’s crust to fold upward.
What is shear stress and provide one example.
Two plates are sliding past each other in opposite
directions building up stress and tension as they
go.
Ex. San Andreas Fault
What is compression stress and give one example.
Compression squeezes rocks together often
forming mountains.
Ex. Himalaya’s, Appalachian
What is tension stress and give one example.
Tension pulls rocks of the crust apart.
Ex. Mid-Atlantic Ridge, or East African Rift Valley
How do rift valley’s form?
2 plates pull away from each other (tension stress)
causing a block of land to fall between 2 normal
fault lines.
When are rocks more likely to fold then fault?
Whey the rocks are hot, under pressure, ductile,
and stressed gradually
Why are some countries sinking and other
countries rising?
Compare faulting and folding.
Faulting occurs when rocks on one side of a fault
slide past the other side.
Folding occurs when rocks bend rather than break,
and not fault is produced.
In what ways can plateaus be formed?
1. An gentle uplifting of an area brought on
by horizontal forces.
2. Lava flows
3. The build-up of sediment between
mountain peaks