Transcript Greenhouse Effect - ms. Clayton's 7th grade Science

Greenhouse Effect
Aim: How is the earth's atmosphere similar to a
greenhouse?
What is the Greenhouse Effect?
• If it were not for greenhouse gases trapping heat in the
atmosphere, the Earth would be a very cold place.
• Greenhouse gases keep the Earth warm through a
process called the greenhouse effect.
What is the Greenhouse Effect
The earth's atmosphere traps solar
Radiation aka heat, with
gases such as carbon dioxide, water vapor, and
Methane. These gases allow incoming sunlight to
pass through but absorb heat reflected by the Earth’s surface.
Examples of the Greenhouse Effect
The Greenhouse Effect on Earth
• Rays from the sun in the form of visible light is transmitted
through the atmosphere and absorbed at the Earth’s
surface.
• The Earth then re-radiates or reflects energy in the form of
Heat.
• Greenhouse gases in our atmosphere absorb this infrared
radiation and prevent it from escaping our atmosphere
Types of Greenhouse Gases
• Greenhouse gases:
– carbon dioxide (CO2)
– methane (CH4)
– water vapor (H20)(g)
– CFC’s
– Ozone (O3)
• The absorption of this energy adds more energy to
the atmosphere, which leads to a temperature
increase.
• Without this property of the atmosphere, we would
not be able to live on Earth…Why?
• This is commonly referred to as The Greenhouse
Effect
Global Warming
• Scientists believe that
the possible cause of
global warming may be
The Greenhouse Effect
• Global Warming refers
to an increase in
atmospheric CO2 that
can increase Earth’s
average temperature.
• Carbon dioxide concentrations are increased by:
1. Burning fossil fuels (oil, coal, gasoline)
2. Population Growth (More people=More Resources
Used)
3. Destruction of rain forests and ocean plankton (which
remove CO2 from the air)
Global Warming
• Average
temperatures
have risen more
than 2 °F since
1970 and are
projected to
continue to rise
in the future due
to the amount of
greenhouse
gases emitted
Air Pollution
• Any visible or
invisible particle
or gas found in
the air that is
not part of the
original, normal
composition.
5 Major Pollutants:
1.) Carbon Monoxide
2.) Sulfur Dioxide
3.) Nitrogen Dioxide
4.) Particulate Matter
5.) Ground Level Ozone
• These pollutants can cause acid rain, thinning
of the Ozone Layer, photochemical smog, skin
cancer, and respiratory illnesses.
Energy Resources
• Some resources are not renewable or renew
very slowly
• How long resources will last is hard to predict
Renewable vs. Non-Renewable
• Nonrenewable energy source: used much
faster than it can be replaced
• Renewable energy source: can be replaced as
it is used or cannot be used up.
Types of Renewable Resources
Types of Non-Renewable Resources