Across
- 2. a large natural stream of water flowing in a channel to the sea, lake or another river
- 6. a low area of land between hills or mountains
- 7. species animals or plants that are at risk of extinction
- 9. damage caused to water, air, etc. by harmful substances or waste
- 11. the condition of being populated with excessively large numbers
- 12. a piece of land almost surrounded by water
Down
- 1. a long-term change in Earth's climate, especially due to human activities
- 3. to remove (someone) from a place of danger to a safer place
- 4. a slowly moving mass or river of ice formed by the accumulation and compaction of snow on mountains or near the poles.
- 5. an overflow of a large amount of water beyond its normal limits, especially over what is normally dry land.
- 8. an explosion of steam and lava from a volcano
- 10. the part of the land near the sea