Across
- 3. something that does not use up resources faster than they can be replaced
- 7. force that pushes an object forward
- 8. visual display used to compare categories of data shown as percents or fractions out of 100
- 10. able to move through air easily and quickly
- 12. the removal of large number of trees
- 13. downward force that pulls objects toward Earth
- 14. force that opposes an objects motion
- 15. scientist who studies past by examining human objects and remains
- 17. having a lot of matter in a given space
Down
- 1. standards a design must meet in order to be successful
- 2. melted rock below Earth's surface
- 4. animal that belongs to a group that includes monkeys, apes and humans
- 5. all living and nonliving things that interact with each other in a place
- 6. object made by humans long ago
- 9. flow of ash, rocks, and superheated gases
- 11. living things, like bacteria, that are so small they can only be seen with a microscope
- 14. to break down food into a form the body can use
- 16. develop or change over time