NSES Content Standard D  Earth and Space Science: Earth in the Solar System Grades 5-8, page 161 Gravity is the force that keeps planets in orbit around the sun and governs the rest of the motion in the solar system. Gravity alone holds us to the earth's surface and explains the phenomena of the tides.

 
Benchmark 4B The Physical Setting: The Earth
Grades 3-5, page 68
Things on or near the earth are pulled toward it by the earth's gravity.

Benchmark 4B The Physical Setting: The Earth
Grades 6-8, page 69
Everything on or anywhere near the earth is pulled toward the earth's center by gravitational force.

Benchmark 4G The Physical Setting: Forces of Nature
Grades 3-5, page 94
The earth's gravity pulls any object toward it without touching it.

Benchmark 4G The Physical Setting: Forces of Nature
Grades 6-8, page 95
The sun's gravitational pull holds the earth and other planets in their orbits, just as the planets' gravitational pull keeps their moons in orbit around them.

Benchmark 10B Historical Perspectives: Uniting the Heavens and Earth
Grades 9-12, page 243
The Newtonian model made it possible to account for such diverse phenomena as tides, the orbits of planets and moons, the motion of falling objects, and the earth's equatorial bulge.