earth day

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Across
  1. 5. where garbage is layered with dirt and other absorbing material to prevent contamination of the surrounding land or water.
  2. 6. complex of physical, chemical, and biotic factors that act upon an organism or an ecological community and ultimately determine its form and survival.
  3. 7. an ecological community comprised of biological, physical, and chemical components, considered as a unit.
  4. 9. the natural process of recycling organic matter, such as leaves and food scraps, into a valuable fertilizer that can enrich soil and plants
  5. 10. made of the layers of gases surrounding a planet or other celestial body
Down
  1. 1. plant material (such as leaves, bark, needles, twigs, and cladodes) that have fallen to the ground.
  2. 2. released into the air and are measured by their concentrations, or parts per million, in the atmosphere
  3. 3. study of organisms and how they interact with the environment around them.
  4. 4. the introduction of harmful materials into the environment.
  5. 8. s any type of energy generated by the sun.