Five
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How did this area get this name?
From all the volcanoes and earthquakes located around that area.
In what direction do plates move at a divergent boundary?
Moving apart.
Name an example of a divergent boundary.
Mid-Atlantic Ridge or Great Rift Valley, Africa.
In what direction do plates move at a convergent boundary?
Two plates moving toward each other.
Name an example of a convergent boundary.
Mt. St. Helens in WA or Mt. Everest.
If an oceanic plate pushes under a continental plate, what kind of features often form on the continental plate?
A volcano often forms.
How do plates move at a transform boundary?
Slide horizontally past each other.
Give an example of a transform boundary.
San Andreas Fault, California.
When an oceanic plate and a continental plate collide, which one is always pushed underneath?
The oceanic plate.
What term do geologists use to mean ‘pushed under’?
Subducted/subduction.
As the plates at the Mid-Atlantic Ridge move apart, what fills the space that is created?
Magma fills the space.
Where are the oldest rocks on the seafloor found - close to the ridge or farther away?
Farther away.
How is Earth’s magnetic field ‘captured’ in rocks that are formed along the Mid-Atlantic Ridge?
Lava solidifies and becomes basalt, which contains iron-bearing minerals that point towards Earth’s magnetic pole.
What have scientists learned about the Earth’s magnetic field as they studied the rocks along the Ridge?
The magnetic field has reversed over time.
Label Earth’s four layers and describe each layer’s state and material.
Crust - solid rock; Mantle - superheated rock; Outer core - liquid iron and nickel; Inner core - solid iron and nickel.