Which of the following best explains why Pangaea broke apart into the modern-day continents? A. Earthquakes and volcanoes formed between the continents. B. Changing climate caused ice to form between the plates.
C. Balanced forces caused a change in the motion of the plates.
D. The plates underlying the continents were already in motion.

C. Balanced forces caused a change in the motion of the plates.

Explanation:

Scientists believe that Pangea broke apart for the same reason that the plates are moving today. The movement is caused by the convection currents that roll over in the upper zone of the mantle. This movement in the mantle causes the plates to move slowly across the surface of the Earth.

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.