Plate Tectonics

Which layer of the Earth contains the asthenosphere?

When two tectonic plates collide, the oceanic crust usually subducts beneath the continental crust because it is

If you will visit a place in the Pacific known to be along converging plates, which of these should you not expect to see?

All are primary plates EXCEPT

Using the” triangulation” technique, seismologists can obtain the distances from at least three seismographic stations, plot the values, and find their common intersection, which is the (a)   .

The theory of moving lithospheric plates is called (a)   .

The lithospheric plates are believed to be moving slowly. What is the driving force that facilitates this movement?

If the Atlantic Ocean is widening at a rate of 3cm per year, how far (in km) will it spread in a million years?

(a)  

The magnitude of an earthquake can be measured on the (a)   scale.

Volcanoes are classified as active, (a)   or extinct depending on their eruption history.