Across
- 2. so small as to be visible only with a microscope
- 6. the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.
- 11. a division of microorganisms that are related to the bacteria but are capable of photosynthesis. They are prokaryotic and represent the earliest known form of life on the earth.
- 12. a long, seismically active submarine ridge system situated in the middle of an ocean basin and marking the site of the upwelling of magma associated with seafloor spreading
- 13. who formulated the first complete statement of the continental drift hypothesis
- 14. a colorless, odorless flammable gas which is the main constituent of natural gas. It is the simplest member of the alkane series of hydrocarbons.
Down
- 1. the gradual movement of the continents across the earth's surface through geological time.
- 3. the floor of a sea or ocean
- 4. the action or process in plate tectonics of the edge of one crustal plate descending below the edge of another
- 5. layered, biochemical, accretionary structures formed in shallow water by the trapping, binding and cementation of sedimentary grains in biofilms
- 7. an individual animal, plant, or single-celled life form.
- 8. the weather conditions prevailing in an area in general or over a long period
- 9. the hypothetical landmass that existed when all continents were joined
- 10. Cell cells that have specific structures and functions in the body