Chapter 25 Flashcards
Mountain ranges on the seafloor separated by valleys
Mid-ocean Range
A long, narrow depression
Rift Valley
The boundary where two plates collide
Convergent Plate Valley
When a thick and buoyant continental plate meets a thin and dense oceanic plate, the denser plate dives beneath the continent in a process called…
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 direction.
Transform Plate Boundary
The sudden movement or vibration of the ground that occurs when rocks slip and slide along enormous cracks in Earth’s crust called faults.
Earthquakes
A crack in Earth’s crust along which rock has moved
Fault
Sudden release of strain energy and moves along a fault
Elastic Rebound
The point of orgin for an earthquake
Focus
The point of Earth’s surface directly above the focus
Epicenter
Who came up with the Continental Drift hypothesis?
Alfred Wegener
What were some pieces of evidence that supported his hypothesis?
- The Coastlines matched up like puzzle pieces
- He looked at large land animal fossils
- Mountain ranges matched up and had similar rock types and rock age.
What was the name of the “Super Continent”?
Pangaea
Who came up with the Seafloor Spreading hypothesis?
Harry Hess
How did Harry Hess come up with the Seafloor Spreading hypothesis (what did he use)?
Sonar
Who discovered the mid-ocean (MOR) ridge?
Harry Hess
Where can we find younger rock on the seafloor? Near the (MOR) or further from the (MOR)?
Closer to the (MOR)
What are the 3 types of plate boundaries?
- Divergent Boundary
- Convergent Boundary
- Transform Boundary