CH 25 Flashcards
a system of mountain ranges on the seafloor separated by valleys.
mid ocean ridge
a long narrow depression.
rift valley
the boundary where to collide is called convergent plate boundary.
convergent plate boundary
when a think and buoyant continental plate meets a thin and dense oceanic plate the denser the plate dives beneath the continent in a process.
subduction
the boundary between two plates that are moving apart.
divergent plate boundary
this type of boundary where plates slide horizontally past each other in opposite directions.
transform plate boundary
An earthquake is sudden movement or vibration of the ground that occurs when rocks slip and slide along enormous cracks in Earths crust called faults.
earthquake
A fault is a crack in earth crust along which rock had moved.
fault
this sudden release of strain energy as rock moves along a fault.
elastic rebound
the point of origin for an earthquake.
focus
the point on earths surface directly above the focus.
epicenter
Who came up with the continental drift hypothesis?
Wegener
Evidence that wegener found to support his hypothesis.
- coast lines match up like puzzles pieces
- large land animal fossils
- mountain ranges match up and the rocks are made up of the same composition and age
What was the name of the super continent
Pangeea
Who came up with the seafloor spreading hypothesis
Harry Hess
