this ppt tells you in brief about the process of the oxygen cycle and the ozone layer and its depletion!!!

3. The oxygen cycle is the biogeochemical
cycle that describes the movement
of oxygen within its three main reservoirs:
the atmosphere the total content of
biological matter within the biosphere and
the lithosphere

4. Biosphere (living things)
Lithosphere (Earth’s crust)
Atmosphere (air)
Hydrosphere(water)
The reservoirs are the
locations in which oxygen is
found.

6. Within the biosphere and atmosphere, plants
begin the oxygen cycle and animals continue
it.
. Much of the oxygen present in the
atmosphere is used during respiration and
decay mechanisms, where animal life and
bacteria consume oxygen and release carbon
dioxide.
Oxygen is also cycled between the biosphere
and lithosphere.

7. Plant release oxygen into the atmosphere
as a by-product of photosynthesis.
oxygen

8. Plants take in carbon dioxide and water
and use them to make food. Their food is
simple sugar — glucose.

10. Animals take in oxygen through the process of
respiration.
Animals then break down sugars and food.

11. The process that breaks apart simple food
molecules to release energy.
Process → oxygen is abstracted from air,
transported to cells for the oxidation of
organic molecules while CO2
and H2O, the
products of oxidation, are returned to the
environment
In your cells, oxygen is used to split glucose
apart — releasing energy, water and carbon
dioxide

13. Carbon dioxide is released by animals and used in
plants in photosynthesis.
Oxygen is balanced between the atmosphere and
the ocean.

14. The oxygen cycle begins with plants
and photosynthesis.
Through photosynthesis, plants
convert the energy from the sun and
water into carbohydrates and
oxygen.

17. The ozone layer refers to a region of Earth's stratosphere
that absorbs most of the Sun's UV radiation.
It contains high concentrations of ozone (O3) relative to
other parts of the atmosphere.
The ozone layer is mainly found in the lower portion of
the stratosphere.

18.  Ozone depletion describes two phenomena : a steady decline of about 4%
per decade in the total volume of ozone in Earth's stratosphere, the ozone
hole.
 CFCs and other contributory substances are referred to as ozone-depleting
substances .

20.  The primary cause of ozone depletion is the presence of chlorine-
containing source gases (primarily CFCs and related halocarbons).
 Most of the ozone that is destroyed is in the lower stratosphere, in
contrast to the much smaller ozone depletion through homogeneous
gas phase reactions, which occurs primarily in the upper stratosphere.