Across
- 3. a reduction in the pH of the ocean over an extended period of time, caused primarily by uptake of carbon dioxide (CO2) from the atmosphere.
- 5. a long term change in the earth's overall temperature with massive and permanent ramifications
- 6. the gaseous envelope surrounding the earth
- 8. materials or substances occurring in nature which can be exploited for economic gain.
Down
- 1. a gas that contributes to the greenhouse-gases effect by absorbing infrared radiation
- 2. a natural event such as a flood, earthquake, or hurricane that causes great damage or loss of life.
- 4. a mesure of the warmth or coldness of an object or substance with reference to some standard value
- 7. a natural fuel such as coal or gas, formed in the geological past from the remains of living organisms.