1.1 Air Around Us
Terms in this set (21)
the condition of Earth's atmosphere at a particular time and place
the envelope of gases that surrounds the planet
smallest unit of a chemical element that can exist by itself
made up of two or more atoms
Earth's atmosphere is made up of
most abundant gas in the atmosphere; N2
makes up a little more than three fourths of air; O2
second most abundant gas in the atmosphere; makes up less than one fourth of air; essential to living things
take oxygen directly from the air and use it to release energy from their food.
release oxygen as a waste product of photosynthesis
involved in burning fuel, and oxidation (rusting) reactions.
Oxygen and nitrogen together
make up 99% of dry air
Argon and carbon dioxide
make up most of the remaining 1% of dry air
only small amounts of them are present: neon, helium, methane, krypton, hydrogen
H2O in the form of a gas (not steam)
air also includes solid and liquid particles of
Atmosphere is constantly changing because
gases move into/out of living things, land, water.
Earth's atmosphere makes conditions on Earth suitable for living things because
contains oxygen and other critical gases
Earth's atmosphere protects living things from
dangerous solar radiation and meteoroid impacts
Earth has seasons because
its axis is tilted at 23.5 degrees as it revolves around the sun. Be sure you can explain and draw a seasons diagram.
The Earth's distance from the sun
does NOT cause seasons; in fact, Earth is closest to the sun (perihelion) on January 3rd and furthest (aphelion) on July 4th.
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