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Authoritative PPT Summary
"Atmosphere" PPT
Part One: The Existence of the Atmosphere
Mainly concentrated at an altitude of about 1,000 kilometers above the earth's surface.
The atmosphere appears very thin compared to the radius of the Earth.
Importance of the atmosphere:
1. It is one of the conditions for the existence of life on earth
2. It allows various complex weather changes to occur and also makes the temperature difference between day and night on the earth’s surface relatively small.
3. Blocks a large part of ultraviolet radiation and the impact of small celestial bodies
think
Comparing the environmental characteristics of the moon's surface, what would the earth be like without an atmosphere?
Atmosphere PPT, Part 2: Temperature of the atmosphere
The range of atmospheric temperature is approximately -84~2500℃
(1) What do the abscissa and ordinate in the figure represent?
(2) How does the atmospheric temperature change as altitude increases?
According to the characteristics of the vertical distribution of atmospheric temperature, how many layers can the atmosphere be divided into?
The first layer 0~12 decreases as the height increases.
The second layer 12~55 increases with height.
The third layer 55~85 decreases as the height increases.
The fourth floor is above 85 and increases with height.
Atmosphere PPT, Part 3: Troposphere
Characteristics of the troposphere:
1. It is the bottom layer of the atmosphere. The thickness is about 8 kilometers at the poles and increases to 17 to 18 kilometers at the equator.
2. The troposphere concentrates about three-quarters of the earth's atmospheric mass and almost all water vapor and solid impurities.
3. The most striking feature of the troposphere is the strong convective motion.
experiment one
What you observe is that the water will flow upward from the place heated by the alcohol lamp, and then the water at the other end of the tube will flow over to replenish it, forming convection of the water.
Experiment 2
Light a piece of incense stick, insert it horizontally on the plasticine, turn a large beaker upside down on the table, and place the incense stick in the middle. The smoke of the incense rises in the middle and sinks around, forming convection.
The air in the heated area rises, and the air in the lower temperature areas on both sides sinks, that is, the hot air rises and the cold air falls, forming air convection.
Atmosphere PPT, Part 4: A little test of your skills
1. In the hot summer, the best place to install the air conditioner is ________; in the cold winter, residents in the north must install radiators in their homes, and the radiators should be installed in the ________.
A.Anywhere B.On a wall close to the ground
C. The middle of the room D. The wall near the ceiling
2. The correct statement about the troposphere is _______________.
①The temperature increases with altitude
②The tropospheric heights of different surfaces are the same
③The most striking feature is the strong horizontal movement of air
④The weather phenomena in the troposphere are complex and changeable
⑤The heat mainly comes from solar radiation reflected from the ground
3. The Hubble Telescope wears a silver-white "coat" because of its height ( )
A. The air is dense, the temperature is high, and the solar radiation is strong
B. The air is thin, the temperature is high, and the solar radiation is strong
C. The air density is high, the temperature is low, and the solar radiation is weak
D. The air density is low, the temperature is low, and the solar radiation is weak
Keywords: Zhejiang Education Edition eighth grade science PPT courseware free download, atmosphere PPT download, .PPT format;
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