In the Heliocentric Model of the Solar System, why does retrograde motion occur?

How long does it take neptune to orbit the sun?

Match the graph type to its description. 1. uses symbols to describe information pie 2. compares different quantities at the same point in time line 3. compares increases and decreases in a quantity over a period of time bar 4. shows the relationship of parts to each other and to the whole pictograph

Which of the following east asian contries are a peninsula? a. china b. taiwan c. south korea d. mongolia