For each drop$-$down box, select the appropriate word from the drop down that best completes the sentence.

Earth rotates once each day around its $$

Earth rotates from west to east, which is why the Sun and stars appear to rise in the

$$

Unless you live quite far north or south, you are whirling around Earth's axis at a speed of more than $$ kilometers per hour.

Earth orbits the Sun, completing one orbit each $$

Earth's orbital distance varies slightly over the course of each year, but the average distance is one $$

We are racing around the Sun at a speed in excess of $$ kilometers per hour.