1-7 Flashcards
The core has_____ percent of the earths mass
33
What is the core mostly made of
Iron
How thick is the crust
5-100 km thick
The crust has ________ percent of the earths mass
Less than 1
Two types of crust are_____.
Oceanic
Continental
Average thickness of oceanic crust is______.
5-8 km
Composition of continental crust is similar to______.
Granite
Composition of oceanic crust is similar to______.
Basalt
Average thickness of continental crust is____.
30 km
Oceanic crust is _____ than continental crust
Denser
The mantle holds_____ percent of the earths mass
67
Mantle is made mostly of ___________.
Iron and magnesium
The _____ is the outer most rigid layer of the earth
Lithosphere
The lithosphere is made up of what two parts~
Crust
Rigid upper part of the mantle
The ______ is the soft layer of the mantle in which pieces of the lithosphere move on.
Asthenosphere
The _______ is the strong lower part if the mantle
Mesosphere
The ______ is solid
Inner core
The lithosphere is broken into______.
Tectonic plates
How do plate tectonics move.?
Heat within the earth moves the asthenosphere which moves the tectonic plates on the surface
Who developed the theory of continental drift
Alfred Wagner
What is it called when pieces of oceanic crust move away from eachother
Divergent boundries
Example of a divergent boundary is
Mid atlantic ridge
When continental crust is pushed into oceanic crust it is called________.
Continental-oceanic collisions
The oceanic crust is pushed underneath… This is called_______.
Subduction
