Functions of the Atmosphere
1. protect from solar radiation
2. matter exchanges
3. temperature regulation
What are the two environmental impacts of human actions?
pollution and greenhouse effect / global warming
What is the atmosphere and when did it begin to form?
a thin layer of gases that surrounds our planet. It began to form 4600 million years ago.
What is terrestrial air composed of?
nitrogen
oxygen
argon
small amounts of other gases combined (carbon dioxide, water vapor, methane)
dust in suspension and polluting substances
25% of solar radiation is retained by the...
ionosphere and ozone layer
the atmosphere has specific conditions of ... and ... that allow the development of living things
composition and temperature
Before live appeared, the Earth's atmosphere was very similar to those of _____ and ______ , which are composed mainly of carbon dioxide and nitrogen
mars and venus
What percentage of the air is made of nitrogen?
78%
most living organisms can't live without exchanging...with the atmosphere
oxygen and carbon dioxide
DEFINITION: the change in the composition of the atmosphere
Atmospheric pollution
what are the layers of the atmosphere?
5. exosphere
4. ionosphere or thermosphere
3. mesosphere
2. stratosphere
1. troposphere
What percentage of the air is made of oxygen?
21%
what are the organisms called that don't need O2 to live?
anaerobes
ANSWER: industries and vehicles, household heaters, large livestock farms, dumps
QUESTION: the diverse origins of polluting substances
What layer of the atmosphere is closest to the surface of the planet?
troposphere
What is atmospheric pressure?
the weight exerted by the air column on a spot of the Earth's crust
without ... there would be no oxygen or ozone
living beings
What are the effects of these substances in the atmosphere? (industries and vehicles, household heaters, large livestock farms, dumps)
acid rain, ozone layer destruction, poisoning of plants and animals, respiratory problems
______ (heavier/lighter) gases are closer to the Earth's surface due to _________.
heavier / gravity
are nitrogen and oxygen heavy or light gases?
heavy