Science Warm-Up Look at the plastic bottle is there anything in it? How do you know? Pg 2

An Ocean of Air

Explore on your own See if you can come up with evidence that air is real. Please complete Is Air There? Activity

How Is Air Like an Ocean? Air and water move around without breaking apart, because they are fluids. Air isn't a liquid, it's a gas, another kind of fluid.

What Makes Up Air? Air is made of molecules of different types of gases The two most common Nitrogen or N2 (78%) Oxygen or O2 (21%) Other trace gases (1% together) Argon Carbon Dioxide Neon Helium Methane Krypton Hydrogen Water vapor Particles

Particles Smoke Dust

Does the percentages of gases in the atmosphere change? Explain your answer

Atmosphere We all live in the ocean of air, called the atmosphere. A layer of gases that surround our planet

How much air? If you were to compare the Earth to an ordinary apple, the atmosphere would be only as thick as the apple's skin. Our atmosphere is only about 500 miles thick With the majority of the gases being found down in the lowest layer of the atmosphere

Functions of the Atmosphere Holds oxygen Holds carbon dioxide Holds nitrogen Regulates temperature Protects from UV radiation Protects from small meteors Necessary for generating sound Necessary for movement of flying animals and aircraft

Homework Have you defined the hot vocab terms Did you draw a picture of each term