Across
- 3. A resource that exists in a fixed amount and can only be replaced over millions of years
- 4. Solid rock layer below aggregate
- 6. Sand, gravel and crushed stone that naturally accumulates on or near Earth's surface
- 7. A natural resource that can be replaced by nature in a short period of time
- 8. The ____ cycle, processes of a key element in the sugars, starches, and proteins, that make up living things
- 9. Resources that come from the biosphere and have life (example: lumber)
- 11. A solid inorganic substance of natural occurrence (example: calcite, salt, bauxite)
- 13. Can take up to 1000 years to form a few cm of ____, but can be lost in minutes due to weathering/erosion
- 15. An essential resource composing 70% of Earth's surface
Down
- 1. The replacement of renewable resources at the same rate at which they are consumed results in a ____ yield
- 2. The process by which productive land becomes desert
- 5. The process of removing salt from seawater to provide freshwater
- 6. Resources that make up non-living entities (example: minerals)
- 10. Natural resource that can be mined for a profit
- 12. Resource such as coal or gas, formed in the geological past from the remains of living organisms
- 14. The resources that Earth provides are known as ____ resources