Plate Tectonics

According to the theory of SEAFLOOR SPREADING, the OLDEST rocks on the ocean floor are found...

• near the continents

• far from the mid-ocean ridges

• at the center of mid-ocean ridges

• near the Ring of Fire

What is the driving force of plate movement?

• Pull of gravity from the Sun and the Moon

• Earth's magnetic force

• Convection currents within the mantle

• Convection currents within the atmosphere

Subduction zones can be found at what type of plate boundary?

• Convergent

• Divergent

• Transform

• All three

Subduction zones often result in what type of land features? (Select all that apply)

• Mountains

• Mid-Ocean Ridges

• Trenches

• Volcanoes

• Rift Valleys

Compared to continental crust, oceanic crust is... (select all that apply)

• More dense

• Less dense

• Thicker

• Thinner

Subduction is when...

• The two plates come together and create an uplift

• The two plates come together and the less dense plate sinks underneath

• The two plate pull apart and the more dense plate sinks underneath

• The two plates come together and the more dense plate sinks underneath

The point on TOP of the surface directly above where an earthquake originates

• Focus

• Fault

• Epicenter

• Plate boundary

If the P and S wave arrival times are CLOSE TOGETHER, then you can assume that the epicenter is...

• Near by

• Far away

P and S waves originate at the SAME TIME, however, you will feel which wave first?

• Surface Waves

• S Waves

• P Waves

Which wave causes the most damage during an earthquake?

• Secondary Waves

• Primary Waves

• Surface Waves