Across
- 2. – A movement that transfers energy through matter or space.
- 5. Factor – A condition that restricts the growth of a population.
- 7. – The loose top layer of Earth where plants grow.
- 8. – When a liquid changes into a gas slowly at the surface.
- 13. – A pure substance made of only one type of atom.
- 14. – A close relationship between two different species living together.
- 15. – The force that pulls objects toward each other.
- 17. (Periodic Table) – A horizontal row of elements on the periodic table.
- 18. – A symbiotic relationship where both organisms benefit.
- 19. – All the different populations living in the same area.
- 22. – The hot, dense center layer of the Earth.
- 24. Energy – Energy related to the heat of an object.
Down
- 1. – An organism that makes its own food, usually using sunlight.
- 3. Metals – Very reactive metals found in the first column of the periodic table.
- 4. Energy – Energy an object has because it is moving.
- 6. Energy – Energy produced by vibrating objects and heard as sound.
- 7. – When a solid changes directly into a gas without becoming liquid.
- 9. Energy – Energy released from the nucleus of an atom.
- 10. – An organism that gets energy by eating other organisms.
- 11. – A mathematical statement showing that two expressions are equal.
- 12. Table – A chart that organizes elements based on their properties.
- 13. – A community of living organisms interacting with their environment.
- 16. – The smallest unit of an element that keeps its properties.
- 20. – Two or more atoms chemically joined together.
- 21. Energy – Stored energy based on position or condition.
- 23. Gas – An element that is very stable and rarely reacts with other elements.