Question

oxygen cycle
photosynthesis ozone waste crust oceans respiration

1. plants release 430 - 470 billion tons of oxygen during process of
2. atmospheric oxygen in the form of provides protection from harmful ultraviolet rays.
3. oxygen is found everywhere on earth, from earth’s (rocks) to the where it is dissolved.
4. oxygen is vital for by animals, a process which produces co₂ and water.
5. oxygen is also necessary for the decomposition of into other elements necessary for life.
6. write the equation for respiration.
7. draw a diagram of the oxygen cycle using the words in the text box.

sulfur cycle
water minerals volcanoes minerals industry ground or rocks
rain pollution matches h₂s insecticide sulfuric acid

1. sulfur in a pure elemental state is most often found near active
2. sulfur is found in all of earth’s environments, including the air, the hydrosphere ( ), the biosphere (living part), and the lithosphere ( or )

Explanation:

1. Plants release oxygen during photosynthesis.
2. Ozone (a form of oxygen) protects from UV - rays.
3. Oxygen is in Earth's crust and oceans.
4. Respiration in animals uses oxygen to produce CO₂ and water.
5. Oxygen is needed for waste decomposition.
6. The respiration equation is C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + energy.
7. A diagram would show arrows between photosynthesis, ozone, waste, crust, oceans, and respiration to represent the oxygen - cycle flow.

For sulfur cycle:

1. Sulfur in pure form is near volcanoes.
2. In hydrosphere (water), lithosphere (ground or rocks).

Answer:

1. Photosynthesis
2. Ozone
3. Crust; Oceans
4. Respiration
5. Waste
6. C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + energy
7. (Diagram description as above)

Sulfur cycle:

1. Volcanoes
2. Water; Ground; Rocks