B5S3

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Across
  1. 3. any natural process that happens to Earth's surface, such as weathering, erosion, or plate tectonics.
  2. 5. water that collects in cracks and pores in underground soil and rock layers.
  3. 6. replaceable by natural means in a short period of time.
  4. 7. the sum of all living matter on Earth.
  5. 8. not replaceable by natural means within a short period of time.
  6. 9. resources that exist in the environment with out human intervention.
Down
  1. 1. something that is needed by organisms and is not infinite in its abundance in the environment; if it is exhausted, then the organisms that need it cannot survive.
  2. 2. a source or supply of energy that can be used to generate electric power to meet people's needs.
  3. 4. the layer of gas surrounding a planet that is held in place by gravity.