Solve these clues to fill the grid.
- A heavy odorless colorless gas formed during respiration and by the decomposition of organic
- 6 Across
- A colorless odorless gas used as a fuel
- 7 Across
- Layer of air around the Earth
- 8 Across
- The watery layer of the earth's surface
- 9 Across
- The outermost atmospheric layer
- 10 Across
- The solid part of the earth consisting of the crust and outer mantle
- 11 Across
- Clear liquid we drink that falls as rain
- 12 Across
- A common nonmetallic element that is normally a colorless odorless tasteless inert diatomic gas
- 13 Across
- The lowest atmospheric layer
- 1 Down
- A water solution of ___
- 2 Down
- The atmospheric layer between the troposphere and the mesosphere
- 3 Down
- The atmospheric layer between the mesosphere and the exosphere
- 4 Down
- A relatively thin sheetlike expanse or region lying over or under another (plural)
- 5 Down