Chapter 25 Flashcards
a system of mountain ranges on the seafloor separated by valleys
mid-ocean ridge
long,narrow depression that forms between peaks along the mid-ocean range
rift valley
the boundary where two plates collide
convergent plate boundary
when a thick and buoyant continental plate meets a thin and dense oceanic plate, the denser plate dives beneath the continent
subduction
the boundary between two plates that are moving apart
divergent plate boundary
a boundary where plates slide horizontally past each other in opposite directions
transform plate boundary
the sudden movement or vibration of the ground that occurs when rocks slip and slide along enormous cracks in Earth’s crusts
earthquake
a crack in the Earth’s crust along which rock has moved
fault
a sudden release of strain energy as rock moves along a fault
elastic rebound
the point of origin for an earthquake
focus
the point on Earth’s surface directly above the focus
epicenter
Who came up with the continental drift hypothesis
Alfred Wegner
What were some pieces of evidence that was backing up this hypothesis
- fossils, large land animals
- coastlines matched up like puzzle pieces
- mountain range matched up with the same rock type and age
What was the name of the super continent
Pangaea
Who cam up with the seafloor spreading hypothesis
Harry Hess
