This scientist developed the theory of Continental Drift.
Who is Alfred Wegener?
100
The movement of the Earth's crust away from the mid-ocean ridge.
What is seafloor spreading?
100
These landforms form along continental-continental convergent boundaries.
What are mountains?
100
Two types of Earth's crust.
What are Oceanic and Continental?
100
Rocks nearest the mid-ocean ridge are ___________, than rock further away from the ridge.
What is younger?
200
Lithospheric plates moving on the asthenosphere
What is the Theory of Plate Tectonics?
200
Earth's plates are made up of these types of crusts.
What is continental and oceanic lithosphere?
200
This event may happen at transform fault boundaries.
What are earthquakes
200
The lithospheric plates move about this far every year.
What is 5cm?
200
Convection currents occur in this area of the Earth.
What is the Asthenosphere?
300
This theory states that all continents were once one major super continent called Pangaea.
What is Continental Drift?
300
When a dense ocean plate moves underneath a less dense continental plate and returns to the mantle.
What is subduction?
300
At this type of boundary new oceanic crust is made.
What is a divergent boundary?
300
This type of boundary occurs when two plates grind past each other.
What is a Transform Fault boundary?
300
This is the main reason Wegener's hypothesis of Continental drift was rejected.
Could not prove the force that caused the movement
400
1. similar coastlines
2. mesosaurus fossils
3. same glacier deposits/debris and scarring
4. same ages of rocks on different continents
5. mountain ranges
What is evidence of Continental Drift?
400
Plate collisions occur along these boundaries.
What are convergent boundaries?
400
Normal faults produce landforms that look like this.
What is steep, steplike?
400
When oceanic plates diverge this happens to the sea floor.
What is sea floor spreading or new ocean floor is made?
400
The layer of rock that flows under pressure.
What is the Asthenosphere?
500
Continental Drift was first rejected because
The force that moved the continents could not be proven.
500
Two plates sliding past each other.
What is a transform boundary?
500
As subduction occurs this type of event may happen on the Earth's surface.
What are volcanoes?
500
Convergent, divergent and transform are types of these.
What are plate boundaries?
500
Why does the Earth not expand as seafloor spreading occurs?
ocean floor subducts back into the mantle near the continents