Chapter 4.1- Earth’s Atmosphere Pages 90-97
Earth’s Atmosphere • Atmosphere- a thin protective layer of air that surrounds the Earth and makes life possible • Atmospheric Gases: 78% Nitrogen, 21% Oxygen, 1% other gases • Solids: dust, salt, pollen • Liquids: water
Troposphere • Lowest layer • Where I live • Weather occurs here • Contains 99% of the water vapor found in the atmosphere & 75% of atmospheric gases • Extends 10 km above Earth’s surface (6.2 miles) • Higher you go the colder it gets
Stratosphere • 10-50 km above Earth • OZONE LAYER that protects us from sun’s UV rays is found here • Planes and jets fly here • The higher you go the warmer it gets because of the ozone layer
Mesosphere • 50-85 km above Earth • Meteors burn up in this layer b/c of friction with air particles (called shooting stars) • Temperature decrease as you go higher in the mesosphere (COLDEST LAYER) • (Least is known about this layer)
Thermosphere • thickest layer of the atmosphere 85 - 500 km above the earth's surface • very high temperatures -90 - 2000C • auroras, northern lights • Ionosphere– located here, a layer of electrically charged gas particles which allows radio waves to travel across the country
Exosphere • outermost layer of the atmosphere 500 km - outer space • few molecules exist in exosphere and thermosphere they have extremely high energy & temps because 1st layer to receive the suns energy • space shuttle and satellites • so few molecules that the wings of the space shuttle are useless it uses rocket launchers • Jason-2 satellite carries tools & sensors to help study ocean.