5th Grade Science AIR Review
What keeps the planets in orbit revolving around the sun?
Gravity
Why is Pluto classified as a dwarf planet?
Pluto has not "cleared its neighborhood" around its orbit.
Name the four planets that fit the following clues:
-closest to the sun
-their surfaces are solid (terrestrial planets)
-made up mostly of heavy metals such as iron and nickel
-have either no moons or few moons
Mercury
Venus
Earth
Mars