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Where is Earth's magnetic field generated?
outer core
When does slab pull occur
when a dense plate sinks into the mantle
What is the primary driver of plate tectonic motion?
convection in the mantle
What kind of rock is at the Coastal Plain?
Young sediments
What is the Appalachian Plateau known for?
coal deposits
Thinner and denser.
Divergent boundaries are associated with what?
Mid-ocean ridges
What formed the Appalachian Mountains?
Continental collision (convergent boundary)
convection in the mantle is caused by
uneven heating inside the earth
What is a fault?
A transform boundary is characterized by what type of motion?
strike-slip
Which province contains the oldest rocks in Virginia?
The Blue Ridge
What is a hot spot?
a mantle plume (A hot spot is a location where magma rises from deep within the mantle due to an unusually hot column of rock called a mantle plume. )
What are the typical properties of continental lithosphere?
old and thick and less dense
What type of boundary typically forms a rift valley
divergent
What do subduction zones commonly form?
trenches and volcanoes
What is Earth's inner core composed of?
solid iron and nickel
What is the valley and ridge province known for?
parallel ridges and valleys
Where do mid-ocean ridges form?
Divergent boundaries
liquid iron and nickel
What is does the lithosphere consist of?
The crust and part of the upper mantle
Where do most large-scale geologic events occur?
plate boundaries
Earthquake activity occurs at what type of boundary?
All boundaries.
Where are magnetic reversals recorded?
Why are topographic maps useful?
They provide 3D information from 2D contours.