Across
- 3. value that tells the number of protons in an element
- 4. transfer of heat through a medium but without the motion of the medium
- 8. a large cloudlike mass of gas and dust in space that may lead to the formation of a star
- 10. an explanation for some naturally occurring event developed from extensive observation, testing, and reasoning
- 11. a force that resists or opposes motion through direct contact
- 13. small bits of rock and dust that have been carried and deposited in the same location
- 14. organelle that contains green pigments and is responsible for photosynthesis
- 17. total of all pushes or pulls exerted on an object
- 19. type of rock that forms when another rock is subject to intense heat and pressure
- 20. substance that is being dissolved by another substance
Down
- 1. an organism in a food chain that obtains nutrients from other organisms
- 2. process by which rocks are broken into smaller pieces
- 5. the changing in direction of a wave after bouncing off the surface of an object
- 6. kingdom containing eukaryotic, heterotrophs with a cell wall
- 7. a type of plate boundary where two plates are pushed together
- 9. result of unbalanced forces acting on an object
- 12. alternate forms of a gene that an organism may have
- 15. an organism that can produce its own food from inorganic sources
- 16. two or more elements chemically combined to form a new substance
- 18. a type of mechanical energy associated with the motion of an object