Solve these clues to fill the grid.
- A heavy odorless colorless gas formed during respiration and by the decomposition of organic
- 4 Across
- Solid homogeneous inorganic substances occurring in nature having a definite chemical composition (plural)
- 6 Across
- The power to do work or make things move
- 7 Across
- A fossil fuel in the ___ state
- 8 Across
- Strength or the ability to control things
- 10 Across
- Of or relating to the heat in the interior of the earth
- 11 Across
- Undesirable state of the natural environment being contaminated with harmful substances as
- 13 Across
- Water at boiling temperature diffused in the atmosphere
- 14 Across
- Clear liquid we drink that falls as rain
- 15 Across
- An increase in the average temperature of the earth's atmosphere
- 1 Down
- A ___ that is driven by the ___
- 2 Down
- A dark oil consisting mainly of hydrocarbons
- 3 Down
- Moving air
- 5 Down
- Fossil fuel consisting of carbonized vegetable matter deposited in the Carboniferous period
- 9 Down
- Slippery liquid used for cooking and fuel
- 12 Down
- Relating to or derived from the sun or utilizing the energies of the sun
- 14 Down