Warm Up How long can a human survive

Warm Up How long can a human survive without: a)Air? b)Water? c)Food?

Rule of 3 • Air- 3 minutes • Water- 3 days • Food- 3 weeks Which of these 3 would be considered the most precious resource?

The Atmosphere All gases that surround Earth’s surface

What is the atmosphere? • All of the gases that surround Earth • Create an insulating “blanket” around the planet that keep the temperature within a constant range • Has changed composition throughout Earth’s history- even now

Why is the atmosphere important for life on Earth? • Provides necessary gases for life – CO 2 – photosynthesis, greenhouse gas – O 2 – Cellular respiration • Protection from harmful radiation, meteors • Warmth- keeps Earth habitable through the greenhouse effect

What gasses are in the atmosphere? • Nitrogen 78% • Oxygen 21% • Other 1% – Other includes Argon, Carbon Dioxide, Methane, Ozone, and Water Vapor

The atmosphere also contains solids – called “aerosols”

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

The Greenhouse Effect • Greenhouse Effect: warming of the Earth’s surface that occurs when CO₂, water vapor and other gases absorb and re-radiate the solar radiation

How does the atmosphere keep us warm?

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

The Greenhouse Effect Pros Cons • Keeps Earth warm enough for life to sustain • Too many greenhouse gases = global warming

Greenhouse Effect Lab https: //youtu. be/Zz. CA 60 Wno. Mk

Atmosphere Stations- 20 min/stn 1 - Layers Foldable 2 - Heat Transfer Demos • Use text and online sources to create your own foldable in your journal • Phones and desktop computers are OK for research if needed • Radiation, Conduction, Convection • 2 set-ups: – Heat Lamp and Thermometer – Confetti – Beaker – Hot plate • Diagram and Labels with explanations of where and how heat is being transferred