24.1 The Atmosphere. 1. Define the atmosphere… 2. What molecule has the highest concentration in the atmosphere? ( oxygen, Carbon dioxide, nitrogen?) 3. Why is the atmosphere important? (3 things). The atmosphere is … t he layer of gases that surround the earth.
2. What molecule has the highest concentration in the atmosphere? ( oxygen, Carbon dioxide, nitrogen?)
3. Why is the atmosphere important? (3 things)
b. Provides Protection from …
c. Provides gasses essential for life
a. Nitrogen (78%), oxygen (21%), other gases and water vapor (1%)
b. Suspended Solid and liquid particles Ash and smoke from fires or volcanoes
1. Acts as greenhouse gas (traps heat) and causes smog.
b. Ozone in Stratosphere= “Good” ozone
1. Made of O3 molecules
2. absorbs UV rays that can be harmful to plants and animals
3. UV radiation is Thermal Energy which warms strato.
c. OZONE HOLE = Thinning of ozone layer
1. Where: over poles
2. Cause:chemicals, CFCs (Chloroflourocarbons), used as coolants in refrigeration and aerosols, get into atmosphere and break apart ozone molecule … allowing more UV in.
a. The atmosphere has weight because of gravity
b. As altitude increases, air pressure and density decreases
c. Measured with a barometer
1. 0-12km (~ 7 mi)
2. Weather & Clouds
3. Greatest air pressure & density
(Gravity pulls air to surface)
4. Temp. DECREASES
with altitude (As air expands it cools)
3. Temperatures WARM from -57C to 0C.
4. Upper strat. is warmer than lower b/c of OZONE LAYER which is absorbing UV radiation
1. 50-80 km (~52 mi),
2. Temps decrease as altitude increases
3. Top of Meso. Is - 90 C
4. Very thin air – moving VERY FAST. Windy (320 km/hr).
5. This burns up meteoroids
1. OUTER MOST LAYER
2. 80 km – outer space
3. TEMP INCREASES w/ Alititude. ( - 90 C to more than 1000 C)
4. Temps. Increase because gas molecules in this layer absorb solar radiation