In how many ways does earth move simultaneously within our solar system?
a. 1
b. 2
c. 3
d. 4

The answer is (c.) 3

The earth moves in 3 ways simultaneously within our Solar System. First is called the Rotation wherein the earth spins on it's axis at 1100 mph at the equator. Second, the earth orbits the sun at average distance of 150 million km every year. Last, the earth's axis shifts about a mile per decade.

Answer(a); // soil salinization and waterlogging;