Across
- 3. rock that forms when melted rock cools and hardens
- 6. a nonliving material made of one or more minerals
- 9. layer of soil with the most minerals and humus
- 10. a mixture of minerals, weathered rocks, and other things
- 11. bits of decayed plants and animals found in soil
- 13. what happens when harmful things get into water, air, and land
- 15. tiny bits of weathered rock or once-living animals or plants
- 17. rock that has been changed by heating and squeezing
- 21. a resource that can not be replaced or reused easily
- 24. soil made from a mixture of sand, silt, and clay
- 25. melted rock inside Earth
- 26. a resource that can be replaced or used again
- 27. color of the powder left when a mineral is rubbed across a white tile
- 28. minerals people value for their beauty
- 29. how a rock's grains look
- 30. describes how light bounces off a mineral
Down
- 1. the hardest mineral
- 2. a solid nonliving substance found in nature
- 4. layer of soil with less humus
- 5. to use resources wisely
- 7. remains of something that lived long ago
- 8. a material that is burned for energy
- 12. peat which has changed into sedimentary rock
- 14. a material on Earth that is necessary or useful to people
- 15. a kind of rock that forms from layers of sediment
- 16. water held in rocks below the ground
- 18. describes how easily a mineral can be scratched
- 19. empty space in rock where something once was
- 20. melted rock that flows onto Earth's surface
- 22. pipes or ditches which carry water
- 23. energy from the Sun