Theories
Sea-floor
Junk drawer
Just the crust
Layers
100
The continents were once united into a single supercontinent named Pangaea
What is Wegener's Continental Drift Theory
100
Where is new seafloor created AND where is old seafloor destroyed
What is the mid-ocean ridges
100
What two processes would cause the height of a Mountain to DECREASE
What is weathering and erosion
100
What is a mid-ocean ridge
100
The Earth's Outermost Layer is known as this?
What is the crust?
200
Could not explain what caused the continents to move.
What was Wegener’s theory missing?
200
Scientists were surprised to find mountain chains and trenches on the ocean floor because they thought it was flat. They were able to make a topographic map of the ocean floor using what device?
What is an Echo Sounder?
200
What happened between 3.5 - 4 million years ago with the magnetic polarity?
What is it was reversed?
200
This is where you find rocks on the ocean floor most dense.
What is near trenches?
200
The continental and oceanic are 2 types of this?
What is the crust?
300
The fit of the continents, fossils, and similar rocks and structures on the opposite sides of oceans.
What is evidence that Wegner used to prove his theory.
300
The YOUNGEST seafloor is located here.
What is closest to the mid-ocean ridge
300
This is a picture of glacier striations found in Africa. What are these evidence for
What is Africa was once in an area of the Earth that had a very cold climate?
300
What process is occurring beneath the plates that helps the plates to move
What is convection
300
This is the reason old oceanic crust is more dense than new oceanic crust.
What is, it is cooler.
400
The continents were once joined in a super-continent and have moved over time is known as this.
What is The Theory of Continental Drift
400
The OLDEST seafloor is located
What is farthest from the mid-ocean ridge
400
What is a similar pattern?
400
The ocean floor sinks below a deep-ocean trench and back into the mantle in a process known as this.
What is subduction?
400
If we compare the temperature and pressure of Earth's mantle to the core, what differences can we expect as we move downward into Earth?
What is, both temperature and pressure increase.
500
This is the currently accepted theory of why the continents move
What is Harry Hess's Theory of Sea Floor Spreading?
500
Sea-floor Spreading adds this to the ocean floor.
What is new material?
500
This forms when continental plates pull apart at a divergent boundary on land.
What is a rift valley.
500
Earth’s lithosphere is broken into separate sections called this
What are Plates
500
Earth's oceanic crust is ______ than continental crust
What is thinner but denser?