Science Olympiad Timed Practice

2. a plant-like organism that breaks down dead or dying plants
4. active at night
6. a path that electricity follows
13. a group of stars that forms a pattern or picture
14. an object that can attract iron and produce a magnetic field
17. an adaptation that allows an animal to blend into its surroundings
18. the bottom layer of soil, made mostly of solid rock
20. all dead; no more left alive on Earth
22. a relationship between tow organisms that helps one or both of the organisms
23. the property of matter that keeps an object at rest or moving in a straight line
24. an organism that makes its own food
26. an instrument for measuring air pressure
28. a basic unit that measures a force, such as gravity
30. a part of a cell that stores water and nutrients
31. a nonliving part of an ecosystem
33. a basic building block of matter

1. the amount of water vapor in the air at any given time
3. the energy of motion
5. solid waste produced by the body during digestion
6. the gel-like substance that fills a cell
7. surface landforms of an area
8. a common rock-forming mineral with large crystals that can be many different colors
9. not allowing light to pass through
10. the addition of harmful materials to the environment
11. to move from one place to another
12. something that slows or stops the flow of energy, such as heat, electricity, or sound
15. an area of land that is drained by a series of creeks and rivers
16. an opening in Earth's crust through which melted rock, hot gases, rock fragments, and ash reach the surface
19. a form of matter that has no definite shape or volume
21. a vascular tissue that conducts water and minerals through a plant
23. a type of animal that has three main body parts and six legs
25. the layer of rock that forms the outer surface of Earth
27. to turn on an axis
29. another name for a saltwater environment
32. the smallest unit of life
34. molten rock that reaches Earth's surface
35. the molten rock beneath Earth's surface