Solve these clues to fill the grid.
- Abrupt electric discharge from cloud to cloud or from cloud to earth accompanied by the emission
- 4 Across
- The lower layer of the crust
- 5 Across
- A deep prolonged loud noise
- 6 Across
- Moving air
- 8 Across
- Plutonic igneous rock having visibly crystalline texture
- 10 Across
- How hot or cold something is
- 11 Across
- Gas in the air that we need to breathe
- 14 Across
- A colorless gas soluble in alkalis and cold water
- 15 Across
- Force pushing on something
- 1 Down
- The commonest type of solidified lava
- 2 Down
- Layer of air around the Earth
- 3 Down
- The solid part of the earth consisting of the crust and outer mantle
- 4 Down
- Hard outer layer of the Earth or of bread
- 7 Down
- A common nonmetallic element that is normally a colorless odorless tasteless inert diatomic gas
- 9 Down
- United States baseball player
- 12 Down
- Frozen flakes that fall in winter
- 13 Down