understanding task 1

12345678910111213
Across
  1. 5. careful management of a resource
  2. 7. increase of nutrients in an aquatic ecosystem
  3. 8. slow development or replacment of a community overtie
  4. 10. a regine of earth with a unique climate
  5. 11. an area of land covered in water for parts of a year
  6. 12. a biome with lots of grass and few trees
  7. 13. where a river flows into an ocean
Down
  1. 1. the varity of species that is in one area
  2. 2. anything that takes up space and has mass
  3. 3. the protection and wise use of a natural resource
  4. 4. the growth of humans around a city
  5. 6. the process by which matter slowly builds up in water
  6. 9. the ability to do work