Forces in Earth's Crust
This is what happens to rocks when they are under greater stress than their own strength.
deformation or fracture
Folding is the result of this type of stress.
compressional
Folded mountains result at what type of convergent boundary.
continental to continental?
Describe the reaction rock has to shear stress.
it causes the rock to distort
The crust will do this as erosion removes the tops of mountains.
rise
Name the four factors that influence the deformation of rock.
temperature, pressure, rock type, and time
List a large geographic location shaped by tensional stress
A continental volcanic arc can be formed at this type of convergent boundary.
ocean to continental?
This is the collision and joining of crustal fragments to a continent.
accretion
The force that controls isostatic adjustment.
gravity
This type of deformation occurs when there is low pressure and low temperature.
brittle deformation
Tensional stresses commonly cause this type of fault.
normal fault
These type of mountains are formed by ocean to ocean convergence.
volcanic island arcs
what causes deformation?
stress
When thick sections of crustal material float higher than thinner slabs is called what.
principle of isostatic adjustment
The deformation in which a rock returns to its original shape and size after the stress is removed.
elastic deformation
List the 3 major types of mountains we've learned so far in the course
folded, fault block, and volcanic
Fault-block mountains are most commonly created by what type of boundary.
divergent boundary
Describe the reaction a rock has to tensional stress.
stretch
This is where the thickest part of the crust occurs.
young mountain ranges
Explain how temperature and pressure can affect ductile deformation.
high temperature/high pressure increase the ductile deformation. During ductile deformation, rocks may change shape without fracturing. An example would be a pencil or glass plate.
The landforms are classified by the dominant processes that form them.
mountains
This is an accumulation of rocks and scraps or pieces of Earth's crust.
accretionary wedge
Name the three types of stress.
tensional, compressional and shear
Because of isostasy, a mountain will ultimately __________ .
be eroded to near sea level