2. TROPOSPHERE
• The troposphere is the lowest layer of the atmosphere
• It is the site of all weather on Earth
• The troposphere contains 75% of the atmosphere’s mass
• It contains 99% of the water vapor in the atmosphere
• The troposphere begins at Earth’s surface and spans a distance of 4 to 12 miles
(7 to 20 km)
3. STRATOSPHERE
• The stratosphere is the layer in which the ozone layer is found
• It is almost completely free of clouds and other forms of weather
• The stratosphere extends from the top of the troposphere to about 32 miles (50
km; 170,000 ft)
4. MESOSPHERE
• The mesosphere is the coldest of the atmospheric layers
• This is also the layer in which a lot of meteors burn up while entering Earth’s
atmosphere, which are seen from Earth as shooting stars
• The mesosphere extends from the top of the stratosphere to the range of 50 to
53 miles (80 to 85 km; 260,000 to 280,000 ft)
5. Ionosphere
• The ionosphere is the layer of the
atmosphere located in the
thermosphere
• This layer is located between the
mesosphere and the exosphere
• It extends from about 50 miles
above Earth’s surface to around
250 miles (80 to 400 km)
Exosphere
• The exosphere is the outermost
layer of the atmosphere
• It is located within the
thermosphere, which also contains
the ionosphere
• The exosphere extends from about
250 miles outward for thousands
of miles (400 km)
THERMOSPHERE
6. 1. Which Layer is the Ozone layer located in?
• A- the stratosphere
• B- the Exosphere
• C- the mesosphere
• D- the troposphere
• E- all of the above
• F- none of the above
• G- a & b
• H- c & d
2. Which layer is the longest?
• A- the mesosphere
• B- the ionosphere
• C- the exosphere
• D- the thermosphere
• E- all of the above
• F- none of the above
• G- a & b
• H- c & d
QUIZ
7. Answers:
1. A- the stratosphere
2. C, d, or h- the exosphere and/or thermosphere (because they both go on forever)(for all we
humans know)
