Old Earth
Ocean Floor
Magnetic Charges
Further Developing Continental Drift
Expanding a Theory
100
All continents were at one time connected together as one giant supercontinent called:
What is Pangea
100
These are mountain ranges in the middle of the ocean.
Mid-ocean Ridges
100
The Earth's magnetic field is currently in a state of:
Normal Polarity
100
What is plate tectonics?
Earth's surface is made of rigid slabs of rock, or plates, that move with respect to each other.
100
How do transform plate boundaries move?
The two plates slide past each other.
200
This idea suggests that all continents are in constant motion on the surface of Earth:
What is Continental Drift
200
What is seafloor spreading?
The process by which magma comes up through vents in mid-ocean ridges, forming new crust and pushing old crust away from the center of mid-ocean ridges.
200
What is reversed polarity?
What is A state in which magnetized objects would reverse direction and orient themselves to point south.
200
What is the difference between plate tectonics and continental drift?
Although both suggest movement of Earth's continents or plates, plate tectonics highlights the relationships between the moving plates.
200
What is subduction?
The process by which the denser plate sinks below the plate that is less dense.
300
Name the three clues Wegener usedto support his idea of continental drift.
Fossil, Climate and Rock Clues
300
Which rock TYPE is the new ocean crust that forms at the mid-ocean ridges?
Igneous
300
This occurs when the magnetic field reverses direction.
Magnetic Reversal
300
What are the three different types of plate boundaries?
Divergent, Convergent, Transform
300
What are the three types of convergent plate boundaries?
Continental-Continental, Continental-Oceanic, Oceanic-Oceanic
400
State one reason scientists did not believe Wegener's idea of continental drift to be true.
It was such a slow process, technology did not exist to prove that the plates moved.
400
These rounded structures form as a result of lava erupting under water and rapidly cooling.
Pillow Lava
400
This is a state in which magnetized objects orient themselves North
What is Normal Polarity
400
How do convergent plate boundaries move?
These form when two plates collide.
400
This is the circulation of material caused by differences in temperature and density.
Convection
500
If the seafloor continues to spread why does the Earth not increase in size?
Crust along the edges get subducted back below the surface of the Earth, causing it to melt and begin the process over again.
500
How do magnetic reversals support the theory of continental drift?
Confirmed that crust was carried away from the center of the mid-ocean ridge.
500
Name one location, we have discussed where a transform boundary exists?
The San Andreas Fault in California
500
The Himalayan Mountains in Asia are a result of which type of plate boundary?
Convergent, Continental-Continental
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