Any planet with a solid surface, such as Earth or Mars

Earth, Mars, and other rocky planets can be thought of as systems. These systems are made up of interacting spheres that can include the __________________________.

Scientists think a planet needs ________________ to support life.

Planetary geologists study rocky planets by comparing them to _________ because we know more about it than we know about the other rocky planets.

Science is both a ______________ and __________________.

Science assumes that objects and events in natural systems occur in _______________ patterns that are understandable through measurement and observation.

Geo =

Bio =

Atmo =