The pieces of the lithosphere that move around on top of the asthenosphere are called —

A. continents
Incorrect. Continents is not the correct answer.

B. ridges
Incorrect. Ridges is not the correct answer.

C. tectonic plates
Correct!

D. subduction zones
Incorrect. Subduction zones is not the correct answer.

The theory that Earth’s lithosphere is divided into pieces that move around on top of the asthenosphere is known as —

A. continental drift
Incorrect. Continental drift is the theory that continents can drift apart from one other and have done so in the past.

B. plate tectonics
Correct!

C. convection
Incorrect. Convection is one of the possible forces that cause the tectonic plates to move.

D. sea-floor spreading
Incorrect. Sea-floor spreading is the process by which new oceanic lithosphere is created as older materials are pulled away.

The image below is an example of what type of tectonic plate boundary?

A. Divergent
Correct!

B. Convergent
Incorrect. A convergent boundary is when two tectonic plates collide.

C. Transform
Incorrect. A transform boundary is when two slide past each other horizontally.

D. Convection
Incorrect. Convection is one of the possible forces that cause the tectonic plates to move.

The images below show the single landmass known as Pangaea breaking into the current landmasses that we know today. The breaking apart of Pangaea to form continents that exist today is used as evidence to support the —

A. Big Bang theory
Incorrect. The Big Bang theory attempts to explain the origin of the Earth.

B. Sea floor spreading theory
Incorrect. The process by which new oceanic lithosphere is created at mid-ocean ridges as older material is pulled away from the ridges.

C. Plate tectonic theory
Correct!

D. Global warming theory
Incorrect. The global warming theory is used to explain the increase in the average temperature of the Earth's atmosphere.