Layers
This is the coolest and thinnest layer.
What is the crust?
The cool and hard layer of the Earth
Lithosphere
The name of the scientist who proposed continental drift
Alfred Wegener
The name of the scientist who is credited with sea floor spreading.
Harry Hess.
This means plates come together
Converge
This is the Earth's layers from the most dense to least
What is the inner core, outer core, mantle, crust?
The gooey and moving layer of the mantle
Asthenosphere
Describe the theory of continental drift.
The continents were once connected and have moved over time.
What feature in the ocean supported the idea of sea floor spreading
Mid ocean ridge.
This means plates separate
Diverge
This is why the Earth's inner core is a solid
What is pressure?
What direction does magma move when it cools?
Sideways/Down.
Explain how fossil evidence is used to prove the theory of continental drift.
Fossils from the same animals are found on separate continents.
Where are the youngest rocks found on the sea floor?
Near the center
Why is gold rare on the surface, but more common in the mantle and core?
Because it is more dense.
This layer is thought to be mostly responsible for the Earth's magnetic field.
What is the Outer Core?
Hot magma rises because it has a lower _____
Density
Describe how rock evidence helped prove continental drift.
Rock layers and mountains matched up on opposite sides of the Atlantic.
Describe the process of sea floor spreading.
Hot magma is pushed up at the mid ocean ridge and is pushed away to the sides.
What would happen if the Earth's magnetic field was to flip in our life time.
We would all get cancer and die.
This layer is composes of Oxygen, Silicon, Magnesium, and Nickel
What is the Mantle
The source of energy for convection currents.
Heat from the core
Why were scratches on rocks significant evidence for continental drift.
They proved glaciers existed on continents currently to warm for them, therefore they must have moved over time.
How do we know that the magnetic field has changed over time?
Magnetic minerals trapped in the rock that point in different directions.
What was the name of the Super Continent?
Pangea