Random
What is the name of a supercontinent?
Pangea
Which layer is the coldest?
Crust
True or False: The Earth is one solid slab of rock
False
Sea floor spreading occurs here.
Mid-Ocean Ridge
Where does subduction occur?
Deep - Ocean Trenches
How are oceanic and continental crusts different?
The oceanic crust is denser than the continental crust
Which layer is made of liquid metal?
Outer Core
What is a plate?
The sections of the lithosphere that are moved by convection currents
True or False, seafloor spreading "recycles" the crust
False
What two types of crust are involved in subduction?
Oceanic Crust and Continental Crust
Name the main layer convection currents exist.
1. Asthenosphere
List all the layers that are solid
Crust, Mantle, and Inner Core
Where is the ocean floor the oldest?
By the deep-ocean trenches before subduction.
Describe subduction.
It is where one plate sinks below another plate and is turned back into magma.
Where is the oldest rock in sea-floor spreading located?
1. Farthest from the two divergent boundaries
Which layer can convection currents occur?
Asthenosphere
Who proposed the theory of continental drift?
Who is Alfred Wegener?
Name an example of sea-floor spreading.
Mid-Atlantic Ridge
Give one example of how subduction is different than sea-floor spreading
1) Seafloor spreading adds crust, subduction gets rid of it 2) Seafloor spreading happens at mid-ocean ridges, subduction occurs at deep-floor trenches.
List the four steps of seafloor spreading
1. Mid-Ocean Ridges form 2. Lava comes out 3. Old rock is pushed away 4. New rock is formed when the lava hardens
What makes up the Lithosphere?
Crust and Upper Mantle
What are the three forms of evidence that support continental drift?
Fossils, Land Features, Climates
Name and draw a picture of how mid-ocean ridges were discovered.
Sonar
The pacific ocean is _____________ while the atlantic ocean is _____________ .
The pacific ocean is shrinking while the atlantic ocean is growing .