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21 terms

Science 7.4

STUDY
PLAY
Deformation
occurs when rock changes shape due to stress
stress
the amount of force on a given area
compression
squeezing
tension
pulling/ stretching
fold
bending of rock layers
Anticline, syncline, monocline
3 types of folds
Anticline
upward arching fold; results from horizontal compression
Syncline
downward fold; results from horizontal compression
Monocline
folded rock layers with one incline or decline where both ends are horizontal;results from vertical compression
fault
surface along which rocks break and slide past eachother
normal, reverse, strike-slip
3 types of faults
normal fault
when the hanging wall moves down relative to the footwall; tension
reverse fault
when the hanging wall moves up relative to the footwall; compression
Strike-slip fault
when the rocks break and the 2 halves move in opposite directions horizontally; results when force is applied from opposite directions
folded mountains
form at congruent boundaries; form when to continents collide and rock layers are squeezed together and pushed upward
fault-block mountains
form when tension causes large blocks of rock to drop down in relation to other rocks; tilting of rock layers can occur as tension pulls the rock layers apart
volcanic mountains
can form at convergent boundaries when the rocks that melted in subduction zones rises to earths surface and erupts to form a volcano
uplift
rising of parts of earths crust to higher elevations
rebound
crust coming back up to original elevation after a weight is removed
subsidence
sinking parts of earths crust to lower elevations
rift zone
forms when tension pulls plates apart creating a set of deep cracks