Earths Forces Test Review Flashcards
(23 cards)
what is the theory of continental drift?
the theory that continents were once conjoined together in one big super continent called Pangea but then they drifted apart
what is the part of earth that the tectonic plates move on?
asthenosphere
what are the pieces of the lithosphere that move around on top of the asthenosphere
tectonic plates
how did the continents drift apart
convection currents, tectonic plates, continental drift and they just drifted
what do most scientists believe causes earths plates to move
convection currents
what fill the gap as the seafloor spreads
magma
what is subduction
when one plates slips under another
describe a divergent plate boundary
when plates move away from each other
describe a convergent plate boundary
when plates collides together
describe a transform boundary
two plates slide past each other in opposite directions
how does tension affect a rock
pulls on a rock making the middle weaker and thinner
how does compression affect rock
squeezes rock until it breaks
how does shearing affect rock
pushes rock in opposite directions
what does stress add to the rock
adds energy to the rock
what type of stress produces reverse faults
compression
what type of stress produces normal faults
tension
what type of stress produces strike slip fault
shearing
describe a normal fault
plates are pulled apart at divergent plate boundaries
describe a reverse fault
plates are being pulled apart at convention plate boundaries
describe a strike slip fault
plates slide past each other at the transform boundary
in normal fault the part of the fault that lies below the other part is called what
the foot wall
describe p waves and how they move
1st to arrive travels through solid and liquid carries energy away from focus through interior
describe s waves and how they move
2nd to arrive vibrant side to side up and down
