warm up how long can a human survive without: a) air? b) water? c) food?
TRANSCRIPT
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Warm Up
How long can a human survive without:
a) Air?b) Water?c) Food?
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Rule of 3Air- 3 minutesWater- 3 daysFood- 3 weeks
Which of these 3 would be considered the most precious resource?
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All gases that surround Earth’s surface
The Atmosphere
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What is the atmosphere?All of the gases that surround EarthCreate an insulating “blanket” around the
planet that keep the temperature within a constant range
Has changed composition throughout Earth’s history- even now
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What gasses are in the atmosphere?
78%
21%
1%
Nitrogen
Oxygen
Other
Nitrogen 78%Oxygen 21%Other 1%
Other includes Argon, Carbon Dioxide, Methane, Ozone, and Water Vapor
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The atmosphere also contains solids – called “aerosols”
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Where is the Ozone layer and what does it do?
Ozone layer is in the stratosphere
The ozone layer absorbs UV radiation from the Sun.
UV radiation is part of the electromagnetic spectrum.
Exposure to UV radiation can lead to skin cancer
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Heat Transfer
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How does the atmosphere keep us warm?
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What are greenhouse gasses?Any gas that can absorb outgoing radiation from earth and radiate it back toward the surface of the planet
Includes Carbon Dioxide, Nitrous Oxide, Water Vapor, and Methane
Keeps Earth’s average temperature @ 55°F
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Why is the atmosphere important for life on Earth?Provides necessary gases for life
CO2 – photosynthesis, greenhouse gas
O2 – Cellular respirationProtection from harmful radiation,
meteorsWarmth- keeps Earth habitable
through the greenhouse effect
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Atmosphere Stations- 20 min/stn
1- Layers Foldable2- Heat Transfer Demos
Use text and online sources to create your own foldable in your journal
computers are OK for research if needed
Radiation, Conduction, Convection
2 set-ups:Heat Lamp and
ThermometerConfetti – Beaker – Hot
plateDiagram and Labels
with explanations of where and how heat is being transferred