Across
- 3. A colorless, odorless flammable gas which is the main constituent of natural gas
- 5. A division of microorganisms that are related to the bacteria but are capable of photosynthesis
- 7. To small to see through the naked eye
- 8. A seafloor mountain system formed by plate tectonics
- 9. German climatologist, geologist, geophysicist, meteorologist, and polar researcher
- 12. The gradual movement of the continents across the earth's surface through geological time
- 13. The remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock
- 14. The weather conditions prevailing in an area in general or over a long period
Down
- 1. The sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate
- 2. Cells that have specific structures and functions in the body
- 4. A supercontinent that existed during the late Paleozoic and early Mesozoic eras
- 6. Layered, biochemical, accretionary structures formed in shallow water
- 10. The floor of an ocean or sea.
- 11. An individual animal, plant, or single-celled life form