Science Crossword

2. a push or pull
4. a measure of the amount of matter in an object
10. a force that acts when two things rub together
11. the basic building block of most matter on Earth
13. the release of a harmful substance into the environment
14. a whirling wind that appears as a dark cloud shaped like a funnel
15. to change slowly over time
16. the part of Earth made up of the crust and upper part of the mantle
19. the bending of light when it passes from one material into another
23. a consumer that eats mainly plants
24. an organism that makes its own food
27. dark organic material made up of decayed plant and animal matter
28. the smallest part of a living thing that can carry out all the processes of life
30. a plant part that contains seeds
31. a cell that can grow into a new organism
32. a plant part that contains a plant embryo, or tiny new plant, and stored food

1. the force that pulls everything down toward the center of Earth
3. a natural object that orbits a planet
5. the process by which some materials take in light energy and change it into heat energy
6. a consumer that eats mainly other animals
7. to spend the winter in an inactive condition that uses little energy
8. an organism that gets energy by eating other organisms
9. a structure inside a plant cell that uses the sun's energy to make food for the plant
12. a body in space that moves in a fixed path around a star
17. a tool used to measure air pressure
18. curves inward, like a bowl
19. to make more of one's own kind
20. the thick fluid inside all cells
21. a material through which heat does not flow easily
22. the control center of a cell
25. the path of a body in space around another body
26. a hill of sand deposited by wind
29. the upper layer of Earth's land surface, in which plants grow