Plate Tectonic/Rocks

The convergence of two continental plates would produce

• island arcs
• rift valleys
• folded mountains
• trenches

The Peru-Chile Trench was formed by tectonic plates which are ______.

• diverging
• moving along a transform boundary
• moving over a mantle spot
• converging

The primary cause of convection currents in the Earth's mantle is believed to be the ____.

•  differences in densities of earths materials due to mantle heat
• weight of the crust
• rotation of the Earth
• occurrence of earthquakes

A rift valley is evidence of which type of plate boundary?

• convergent 
• divergent
• transform
• uniform

Which is denser Ocean crust or Continental crust?

• Ocean
• Continental
• they are the same

As one moves away from a mid-ocean ridge the crust is _______.

• younger
• there is no difference
• older

Which of the following is most responsible for formation of new crust at the edge of a tectonic plate?  

• mountains building at continent-continent convergent boundary
• magma rising up from the mantle at a divergent boundary
• two tectonic plates sliding past one another at a transform boundary
• subduction of one plate under another

New crust is being produced at a mid-ocean ridge.  How does this affect the Earth's crust?  

• The total amount of crust is always increasing
• the new crust is denser than the old
• The total amount of crust is always decreasing
• the older crust is recycled at subduction zones

All metamorphic rocks are formed from _______.  

• compaction and cementation
• heat and pressure
• melting
• cooling

Islands with a higher probability of a volcanic eruption are farther from the hot spot?

• True
• False