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4. an astronomical event occurring twice yearly
6. makes air masses hot
9. temperatures that shape ecosystems and human adaption
10. most basic unit of biological classification
12. created by convergent boundaries
14. this is cooled lava
16. plates create rift valleys because of this
18. the biochemical process by which plants, algae and some bacteria convert sunlight into chemical energy
19. we live on this layer
20. driven by the sun's energy, the process of water that it goes through

1. this everything in the universe beyond Earth's atmosphere
2. they supply energy to consumers
3. the prevailing scientific model explaining the origin and evolution of our universe
5. systems that manage energy flow and nutrient cycling to support life
7. the transfer of heat through the physical movement of liquids
8. turns oxygen to carbon dioxide
11. very carbon-rich and used to make energy
13. it is caused by the cohesive forces between liquid molecules
15. the gases from earth stay here and protect the earth
17. eruptions with ash and hot gases