CH 25 Flashcards
Mountain ranges on the seafloor separated by valleys
Mid-ocean ridge
A long, narrow depression that forms in between peaks along the mid-ocean ridge
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 move apart along the mid-ocean ridge
Divergent plate boundary
Boundary where plates slide horizontally past each other in opposite directions
Transform plate boundary
A sudden movement of the ground that occurs when rocks slip along cracks in the Earth’s crust called faults
earthquake
A crack in the Earth’s crust along which the rock moves
Fault
Produces energy called seismic waves that travel in the Earth.
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?
Wegener
Evidence that Wegnere 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 compostion and age
What was the name of the super continent?
Pangeea
Who came up with the seafloor spreading hypothesis?
Harry Hess
What did Harry Hess use to map the bottom of the seafloor?
Sonar
Who discovered the mid-ocean ridge?
Harry Hess
Where is the youngest rock on the ocean floor located?
MOR
