Earth Layers
What are the three basic Earth layers?
Crust, mantle, and core
Which layer are plate tectonics in?
On top of the mantle
What is a divergent boundary?
Where two plates pull apart
What is a convergent boundary?
Where two plates collide
What is a transform boundary?
Where two plates grind passed one another
Which layer is the largest?
the mantle
How many plates are there?
20
mountain ranges under the ocean are called __________
ocean ridges
What is a subduction zone?
occurs when one plate is forces down beneath another plate
What is caused by a transform boundary?
earthquakes
Which layer is liquid?
outer core
What causes plates to move?
convection currents
What are rift valleys?
deep structures found along the axes of divergent boundaries
mountain range
What boundary between two plates where Earthquakes occur is often called _____________
fault
Why is the inner core solid?
pressure
What is a plate boundary?
Where two plates meet
Seafloor spreading produces _____________
new oceanic crust
Convergent boundaries in the ocean often create what kind of landform?
underwater volcanoes
What is believed to cause Earth's magnetic field?
movement of metals in the Outer Core
Explain the Plate Tectonics Theory
The lithosphere is composed of plates that are constantly moving
What are the three landforms caused by divergent boundaries?
Oceanic ridges, rift valleys, and seafloor spreading
What are the three types of convergent boundaries?
oceanic-oceanic, oceanic-continental, and continental-continental