Across
- 5. the branch of biology concerned with the study of life on earth and in space.
- 6. an attraction the earth exerts on an object or the object exerts on the earth
Down
- 1. The distance Earth orbits the Sun is just right for water to remain a liquid
- 2. the action of rotating around an axis or center.
- 3. the envelope of gases surrounding the earth or another planet.
- 4. an instance of revolving