Can you describe what you see in this picture? In this chapter you will learn about Earth’s atmosphere, and the gases that support life.
Size of the Earth 1. Diameter = from the north pole to the south pole it’s ~ 7916 miles 2. Circumference ~ 24,901 miles Equator- imaginary line that divides the earth into hemisphere’s (north and south)
Stratosphere Jet stream winds- strong eastward wind that blows horizontally around the earth
Stratosphere Ozone layer Cold = -76°f Warm = 64° f Ozone ( a form of oxygen, O3) reacts with the uv light to warm the air Protects earth from harmful uv radiation
Stratosphere Temperatures increase as you ascend. Why? The Ozone Layer absorbs ultraviolet rays, giving off heat. The Jet Stream
Video-15 min http://www.youtube.com/watch?v=L4CX7 GL_DPo
Mesosphere coldest area of the atmosphere Shooting Stars- what are they? Protect us from falling meteoroids
Meteoroids, meteors and meteorites Meteoroid: An object in space no smaller than a speck of dust and no larger than an asteroid. Most are thought by scientists to be pieces of asteroids or comets. Meteor: The streak of light that forms when a meteoroid burns while traveling at high speed through Earth's atmosphere (a "shooting star" or "falling star"). Meteorite: The remnants of a meteoroid that has passed through the atmosphere and struck the Earth.
Thermosphere No definite Limit Very Hot? Why Nitrogen and Oxygen absorb a lot of UV radiation and convert it to heat Thin air makes seeing objects in space more easily.
Ionosphere Lower layer of the thermosphere Gas molecules are electrically charged Radio waves bounce back Brilliant light displays of aurora borealis occur here
Thermosphere No definite upper limit Outer layer of thermosphere Satellites orbit Earth here Communicate long-distance telephone and television signals Watch weather and weather patterns Exosphere
Magnetosphere Extends above Earth Magnetic field that traps charged particles from the sun Particles follow the lines of magnetic force and bounce back and forth from one pole to the other Sometimes breaking through into the ionosphere to produce auroras