w3 Flashcards
what makes the plates move?
convection current
elastic or plastic-like
part of the mantle
asthenosphere
A force that acts on rock to
change its shape or volume.
stress
types of stress
Tensional stress
Compressional stress
Shear stress
happens at divergent boundaries
tensional stress
happens at convergent boundaries
compressional stress
happens at transform boundaires
shear stress
➡⬅
compressional stress
⬅➡
tensional stress
⬇⬆
shear stress
rocks get thinner in the middle
as it is pulled apart.
tensional stress
boundaries between two
plates that are colliding.
compressional stress
rock is pushed in two opposite directions or sideways.
shear stress
formed when rocks experience
compressive stress and deform,
causing the rocks to bend.
folds
types of folds
monocline
anticline
syncline
“one step” bend
monocline
convex upward, A
anticline
concave upward, U
syncline
break or crack in Earth’s lithosphere
along which the rocks move.
faults
parts of a fault
footwall (block)
hanging wall (block)
is the rock that is placed
on top of the fault.
footwall block
is the rock that is below the fault.
hanging wall block
moves in a fault
footwall block
does not move in a fault
hanging wall block
types of fault
Normal Fault
Reverse Fault
Strike-Slip Fault
A rock is pulled apart by
tension in Earth’s crust.
Rock drops down as it
breaks.
normal fault
Rock is forced upward as it
is squeezed by
compressional stress.
A continental plate colliding
with another continental
plate
reverse fault
Rock is sheared (or cut)
from sheer stress.
Rocks on each side of
the fault slip past each
other as they break.
strike-slip fault
