EARTH’S ATMOSPHERE Chapter 14.1 Pages 392 - 398.

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Presentation transcript:

EARTH’S ATMOSPHERE Chapter 14.1 Pages 392 - 398

ATMOSPHERIC GASES 78% Nitrogen 21% Oxygen 1% Trace gases - argon, carbon dioxide, water vapor, etc.

LAYERS OF THE ATMOSPHERE (LOWER) Troposphere – lowest layer (0-10 km) Where life exists 75% of the atmospheric gases Weather occurs here Stratosphere – (10-50 km) 99% of gases are here and below Pressurized aircraft (jets) above weather Ozone layer

LAYERS OF THE ATMOSPHERE (UPPER) Mesosphere (50-80 km) Temperature reaches the lowest point -90o C = -130o F Thermosphere –2 parts Ionosphere (80-550 km) Contains ions which are electrically charged particles Ions reflect radio waves back to earth Ions interact with air to cause auroras

Exosphere (550 – 2500+ km) Hottest layer in the atmosphere (600-1000o C)

ATMOSHPERIC TEMPERATURE Changes as you move through the atmosphere Heated by absorbing energy from the sun Different gases absorb different amounts of energy

ATMOSPHERIC PRESSURE Sea level has the greatest amount of pressure. Density is greater at the bottom of the atmosphere Density decreases as you rise through the atmosphere The greater the density, the greater the pressure