The Atmosphere intro 0.0 / 5 ? OtherThe EarthUniversityNone Created by: MariaC5Created on: 25-02-18 16:07 36214 Across 1. 'Pure substances made up of two or more elements in a fixed, characteristic chemical composition' is the definition for (9) 4. Nitrogen has what kind of bond? (7) Down 1. Stars form in hot or cool regions? (4) 2. 'Substances that cannot be broken down into simpler ones by any chemical means' is a definition for (8) 3. Gravity could only --- the expansion of the universe (4, 4) 6. The lifetime of a star depends on what? (3, 4)
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