Test Questions
How Andes Mountains were formed?
an oceanic plate
What type of boundaries most likely form active volcanoes?
Convergent boundaries
What is a transform boundary and give an example?
A transform boundary is a plate boundary where the plates slide past each other. The San Andreas fault is an example.
What is the role of density of rock in convection current?
Warm air rises while cold air sinks
How were the Hawaiian islands and Yellowstone formed?
The Hawaiian islands are believed to have been formed by the crust passing over a hot spot in the Mantle under the Pacific Ocean
How was Himalayas formed?
two plates colliding
Where can the results of plate movement be seen?
At plate boundaries and rift valleys
What is the rate of movement of plates?
1 to 2 inches per year
What type of plate boundary does seafloor spreading occur at?
Divergent plate boundaries
How are ages of landforms around hot spots determined?
Mantle plumes that form hotspots are thought to be relatively stationary whereas the overlying tectonic plates typically are not.
In what direction does warmer material move in a convection current?
Warmer material moves up towards the surface.
Great Rift Valley in Africa is what type of plate boundary?
Divergent boundary
What makes up the asthenosphere?
Semi-plastic rock
What type of boundaries do trenches occur at?
Convergent plate boundaries
What currents inside Earth drive plate motion? What is the source of this energy inside Earth?
Convection currents and radiant heating from the sun.
How are mountain ranges formed?
They are formed at convergent boundaries between
What is the purpose of the asthenosphere?
A critical role in the movement of plates across the face of Earths surface
What is some evidence of continental drift?
What is the difference between a convergent and a divergent plate boundary?
Convergent boundaries collide with each other while divergent boundaries move away from each other.
What is the cycle of a convection current?
The heated molecules take up more space and rise to the top, while the cooler molecules sink to the bottom. These cooler molecules then become heated. The process is repeated. This cycle is called the convection current.
What makes up the lithosphere?
The crust and uppermost part of the mantle
Where is there evidence of magnetic pole reversals and how do we use it to determine the age of rocks?
examining the geologic record