Solve these clues to fill the grid.
- A relatively thin sheetlike expanse or region lying over or under another (plural)
- 3 Across
- The lowest atmospheric layer
- 6 Across
- A period of the year marked by special events or activities in some field (plural)
- 8 Across
- The regions of the surface and atmosphere of the Earth where living organisms exist
- 9 Across
- The quantity of water falling to earth at a specific place within a specified period of time
- 11 Across
- A transformation in which the coordinate axes are ___ by a fixed angle about the origin
- 12 Across
- Hard outer layer of the Earth or of bread
- 16 Across
- A straight line through a body or figure that satisfies certain conditions
- 1 Down
- The watery layer of the earth's surface
- 2 Down
- The largest ocean in the world
- 4 Down
- A drastic and far-reaching change in ways of thinking and behaving
- 5 Down
- The process of becoming a vapor
- 7 Down
- The star our planet orbits
- 10 Down
- Huge body of salt water (plural)
- 13 Down
- The 2nd largest ocean
- 14 Down
- The planet we live on
- 15 Down