| A | B |
|---|
| Natural gas is | clean burning |
| Natural gas is primarily | methane |
| Natural gas is commonly | associated with oil deposits |
| Nebula | an interstellar cloud of dust |
| Neptune | Eighth planet from the Sun |
| Triton | Neptune's largest moon |
| Sir Isaac Newton | undoubtedly the most influential scientist ever |
| Nicotine can cause Cancer | Emphysema Heart Disease Stroke |
| Nicotine activates | reward pathways in the brain |
| Research suggests that nicotine use | contributes to heart disease |
| A nitrite is either a | salt or an ester of nitrous acid |
| Oil is a | non-renewable energy source |
| Soil Organisms: | micro-organism, earthworms, insects |
| Soil macro-nutrients: | nitrogen, phosphorous and potassium |
