Across
- 6. an land area channeling rain/snowmelt to streams, rivers to ouflows like reservoirs, bays, oceans
- 7. when large populations of organisms die
- 9. a thin layer of gas from the soil up
- 10. all water on earth
- 11. from rock below the soil to earth's core
Down
- 1. rocks created from weathering, dissolution, precipitation, lithification
- 2. a layer of soil surrounding the earth
- 3. rocks from hot molten lava that crystalize and solidify
- 4. when large portions of earth are covered by ice sheets
- 5. all life on earth
- 8. rocks created from heat and pressure
- 12. a mountain building event