Plate tectonics

Geologists have long recognized that earthquakes are not randomly distributed on Earth but occur in concentrated areas that coincide with __________ and provide evidence for the theory of ___________ .

• mountain ranges; fault zones.
• continental borders; supercontinents.
• plate boundaries; plate tectonics
• areas of liquid magma; sea floor spreading.
  

The movement of the tectonic plates is caused by

• the rotation of the Earth.

• convection currents in the Asthenosphere

• the gravity of the iron-nickel core.

• the Moho discontinuity.

New crust is created at this type of  boundary.

• Divergent
• Convergent, Subduction Zone
• Transform 

Earthquake epicenters (center of where the earthquakes started) were mapped for a 35 year period in the diagram above. The black dots indicate these epicenters. The black dots appear along what feature on Earth?

• hot spots

• plate boundaries

• rift zones

• sea floor spreading

This boundary is described by two plates moving away from eachother along the edges and separating. The resulting gap allows magma to rise and create new crust, forming new lithosphere. 

• Convergent Boundary 
• Divergent Boundary  
• Transform Boundary

Observe this diagram of a plate boundary. One statement BEST describes what is happening. It is that

• the oceanic crust is melting.

• the denser ceanic crust is subducting under the less dense oceanic crust

• volcanic islands are forming.

• the tectonic plates are moving away from each other.

Mid Ocean Ridge Formation  is created at this type of  boundary.

• Divergent 
• Convergent
• Transform 

The Earth’s surface is not a solid surface but is divided into

• several oceanic plates.
• continental and crustal plates.
  
• seven continental plates.
• continental and oceanic plates.
  

Which explains that the continents were once joined together and over time they broke up and then drifted apart?

• Plate Tectonic Theory
• Continental Drift 

What geological forces might be responsible for this range of mountains?

• diverging tectonic plates
• erosion of the land by the ocean
• converging tectonic plates
• deposition of sediments by the ocean