Layers of the
earth A
earth A
The layer of the earth that we live on.
What is the crust?
This is the smallest layer, only 5 to 50 km thick.
What is the crust?
These are the three types of heat transfer:
What are radiation, conduction, and convection?
What is the name of the theory that states the earth's crust is made of large sections moving over the mantle.
Plate tectonics
Yes, gravity plays a role. What else?
The greater density of the oceanic crust causes it to sink under the continental crust.
This is the largest layer of the earth, sits below the crust.
What is the mantle?
A special type of crust that makes up the land on earth.
What is continental crust?
This man proposed the hypothesis of continental drift.
Who was Alfred Wegener?
This is the process that produces new crust.
What is sea floor spreading?
What type of plate boundary occurs where the plates are being pulled apart and making new crust?
Divergent
The layer of the earth that is liquid.
outer core
A special type of crust that makes up the land under the water. What is it made of?
What is oceanic crust? What is basalt?
These are the three pieces of evidence Wegener used to support his hypothesis.
Land features, Fossils, Climate
This is where old oceanic crust sinks down into the mantle.
What are deep ocean trenches?
1) Plate boundaries that come together are called:
2) This type of plate boundary occurs when two plates slide past each other.
1) Convergent
2) Transform
The layer of the earth that makes up the central part of the earth.
inner core
This layer is molten iron and nickel.
outer core
This is the reason Wegener's hypothesis was rejected at first.
He could not explain the force that moves the continents.
This is the force that moves the continents. Where is this force found?
What are convection currents in the mantle?
These are the three pieces of evidence that support the concept of sea floor spreading
Molten material, magnetic stripes, ages of rock
This layer is made up of solid nickel and iron.
inner core
These are the two layers of the Earth in which convection currents occur.
What are the mantle and outer core?
This has been found in colder climates (like Antarctica) that helps prove the continental drift hypothesis.
What are fossils of tropical plants?
This is how fast Earth's lithospheric plates move
About as fast as your fingernails grow, or 1-10 cm per year.
How do geologists study Earth's interior?
I am looking for two types of evidence they use, and what these are specifically
Direct evidence from rock samples; indirect evidence from seismic waves