In 150 BC, Seleucus of Seleucia theorized that the moon causes the tides. Scholars learn about what causes tides by studying the interactions of gravity between the sun, moon, and Earth. They use technology to formalize otherwise...

Students simulate how the Moon causes ocean tides. In this earth science lesson, students calculate gravitational acceleration using a mathematical formula. They compare the force of attraction between the Earth, Moon and Sun system.

Sixth graders explore the characteristics of gravity. They discuss gravity on Earth and then use cereal boxes to research and compare the weight of objects on Earth to the weight of those objects on other planets.