Vocab 1
All continents joined together creating a supercontinent
Pangea
Molten rock below earth's surface
magma
Who hypothesized continental drift
Alfred Wegener
A continent travels at 0.00001 m/year for 100,000,000 years. How far did the continent travel?
1,000 meters
What type of boundary are folded mountains at
Convergent
The hypothesis that the once connected land mass started to break apart 200 million years ago and slowly drift to its current location
Continental Drift
molten rock on top of earth's surface
lava
What continents had fossil evidence to support continental drift
Africa and South America
(with india,australia,and antarctica)
Who discovered mid-ocean ridges
Marie Tharp
At what type of boundary are fault-block mountains at
divergent
Mid-ocean ridges
The theory that earth's surface is made up of rigid slabs of rock that move with respect to each other
Plate tectonics
Why was Wegeners hypothesis not automatically accepted
Why does the earth's crust spread
Hot rock rises and moves in two directions pushing the rocks with it. As it looses heat it cools down and sinks. This causes the sea to spread
They are over top of a hotspot. So everytime the plate moves, and magma rises through the mantle plume a new island/volcano is formed
deep underwater troughs on the sea floor
ocean trenches.
One tectonic plate going underneath another tectonic plate.
subduction
Explain how coal evidence supports the theory of continental drift
coal can be only found in temperate places, it is made from plant fossils. And coal was found in antarctica. Which means Antarctica once had to be closer to the equator.
What can comparing the topographic map and isochron map tell you
That the youngest crust and the midocean ridges are at the same points of the sea floor.
What is the difference between the 3 types of boundaries
Convergent-go toward eachother
Divergent- move away
transform- slide past eachother
The process by which new oceanic crust is continuously forming along the mid-ocean ridges.
Seafloor spreading
A break in earth's crust where movement occurs
fault
Imagine what the plant could look like in 200 million more years. What do you see. Use evidence from the past to support your answer
Any supported answer works
What was discovered between Alfred Wegeners death and the development of the theory of plate tectonics, to make scientist now see that the continents did/do move?
Found that the seafloor is constantly getting new crust and spreading as evidence on the seafloor features.
How can we tell which mountain is older, and why is that a thing.
Older mountains are shorter and smoother. This is because of erosion and the rocks being worn down over time.