FLEX SCIENCE 10 First Grading Assessment Test

Which of the following layers of the earth’s interior is in liquid form?

• outer core

• inner core

• mantle

• crust

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

• denser than continental crust  

• thicker than continental crust

• less dense than continental crust

• thinner than continental crust

Two convergent plate boundaries lie adjacent to each other. If plate is oceanic and the other is continental, what is formed when these two plate boundaries move?

• volcanic arc    

• mountains

• island arc

• rift valley

Which of the following seismic waves travels fastest?

• primary waves

• secondary waves        

• body waves

• they all travel at the same speed

Another subsequent effect of the continuous grinding of plates against each other is the occurrence of ______________.

• volcanic eruptions

• earthquakes

• mid-atlantic ridge

• tsunami

________ are the deepest part of the ocean.

• mountain ranges         

• oceanic ridge

• Pacific Ocean 

• trenches

The magma in the magma chamber of a volcano has a very high amount of silica. If the volcano would erupt, which of the following might happen?

• there is a build up of pressure below the crater of the volcano

• the volcano would erupt violently

• the lava flow is very slow

• all of the above

Most divergent boundaries are situated along underwater mountain ranges called _________.

• volcanic islands

• trenches

• oceanic plates

• oceanic ridges

The lithosphere is composed of the _________.

• crust only

• mantle only

• crust and mantle

• upper layer of mantle

What is formed when plates are pulled away from each other?

• Island arc

• Rift valley

• Volcanic arc

• Mountain range