From the back of the box:
"A perfect formula: The Game of EARTH + family, friends, or classmates = fun and excitement! The toss of a die determines whether you'll be quizzed about Earth's Environment, Atmosphere, Rocks, Tectonics, or Hydrosphere. Four challenging levels permit players of like and different ages and abilities to join together in unraveling the fascinating mysteries of our planet. Be first to correctly answer one question in each of the five categories, and win!"
The game comes with a couple of dice and 150 cards asking educational questions about Earth and its environment; each card has four levels of questions to provide different challenges for different age/knowledge groups. The rules provide with a few different variants of play: "Regular Play", "EARTH Master" (a game show variant for large groups), "EARTH Face-Off" (spelling bee), and "EARTH Challenge" (team play).