Pangea
The supercontinent "Pangea" existed about this long ago.
What is 300 million years?
This is the type of plate boundary where two plates seperate.
What is divergent?
At divergent boundary these two types of features can form.
What are ridges and rifts?
Convection within the Earth responsible for plate movement happens in this layer.
What is the upper mantle?
This type of crust is more dense.
What is oceanic?
This scientist proposed the Theory of Continental Drift.
Who is Alfred Wegner?
This is the type of boundary where two plates move toward each other.
What is a convergent boundary?
When two continental plates with similar densities collide, this will form.
What is a mountain range?
Without this convection in a fluid would stop.
What is heat?
The further away the earth's crust is from this, the older it is.
What is the mid-ocean ridge?
Alpine mountains that match up on various continents prove that this country was once attached to North America, Eurasia, and Africa.
What is Greenland?
This is the type of plate boundary where two plates slide past each other.
What is a transform or slip strike?
At a subduction zone these two features commonly form.
What are trenches and volcanoes?
The molecules in a fluid at moving the most rapidly closest to this.
What is the heat source?
The two main types of rocks that make up the crust are.
What is basalt and granite?
Fossils of different reptiles proved that certain continents were once joined because they could not do this.
What is swim?
If two oceanic plates collide one will subduct due to this.
What is more dense or older?
When two plates move in opposite directions, they create this feature?
What is a fault?
As a fluid starts to cool is will sink because it is becoming more
What is dense?
There are this many major tectonic plates?
What is 7?
The fossil of this ancient fern were found on continents that were once believed to be attached, such as Africa and South America.
What is the glossopteris?
The types of features created at plate boundaries depend on these two factors.
What is the direction of plate movement and type of plates?
A concentration of earthquakes and volcanoes are found at the border of this major tectonic plate.
What is the pacific?
Convection cells at a divergent plate boundary are moving in this direction?
What is clock and counter clockwise or opposite directions?
The oldest oceanic crust on earth would be found at this type of feature.
What is a subduction zone?