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Identify the order of the layers of the atmosphere starting with the layer closest to the ground. troposphere, stratosphere,mesosphere, thermosphere (ionosphere, exosphere)
What layer of the atmosphere does weather occur? troposphere
The stratosphere protects us from the sun's ultraviolet rays because of the ____________ ___________ ozone layer
Why is the ionosphere important? It contains charged particles that reflect radiowaves.
21% of our atmosphere is made up of what kind of gas? Oxygen
78% of our atmosphere is made up of what kind of gas? Nitrogen
Define air pressure. The weight of air being pulled down on an area of Earth's atmosphere.
Why does air have pressure? Air is matter. It takes up space and has mass.
When the altitude increases, what happens to the the air pressure? Air pressure decreases because there is less air (atmosphere) above you.
When the altitude increases, what happens to the density of the air? The density of the air decreases (air molecules and particles become more spread out)
What is a barometer used for? To measure air pressure
Define weather. Weather is the condition of the air surrounding Earth (atmosphere)
What are the two factors that affect air pressure? temperature, altitude (amount of air above you)
Which layer of the atmosphere contains satellites orbiting the earth? exosphere
Why is the mesosphere important? protects us from meteors (meteoroids burn up in this layer)
Identify two ways that the atmosphere makes life on Earth possible. 1. provides us with Oxygen and other gases necessary for survival 2.Provides us with warmth, trapping in heat from the sun 3. provides us with liquid water, carries on the water cycle 4. protects from meteors 5. protects from UV rays
Low air pressure usually indicates what kind of weather? cloudy, rainy, stormy
High air pressure usually indicates what kind of weather? sunny, clear skies
Explain how convection currents work. When a fluid is heated, the fluid becomes warm and less dense causing it to rise. Then, the fluid begins to cool as it gets further away from the heat source. As it cools it becomes denser and sinks. This is a cycle that continues.
How does air move? high pressure(high density) to low pressure (low density)
Study the weather map you created on the "What weather will you see? And the questions you answered about the map. Be able to interpret a weather map with isobars.
Define isobar. A line on a weather map that connects areas with the same air pressure (usually spaced 4 millibars apart)
The thermosphere is composed of what two sub-levels? ionosphere, exosphere
When water is heated in a can and then inverted in an ice bath, why does the can get crushed (implode)? When heated, the water turns to vapor and pushes air molecules out of the can. When cooled, the vapor condenses leaving lots of empty space in the can. The pressure from the air outside of the can crushes the can and pushes water up in the empty space.
During the day, why is air directly above water likely to have a higher air pressure reading? Water takes a while to absorb heat from the sun, so it will not conduct as much heat to the air directly above it. This means the air will be cooler and denser than air directly above land. This cool air creates an area of high air pressure.
Which has a higher air pressure, cool air or warm air? cool air is denser, so it is more likely to sink. When the air sinks it puts more pressure on the ground beneath it.
What does the distance between isobars on a map tell you? wind speed- the closer the isobars are, the faster the wind
Air pressure is typically measured in what two units? millibars, or inches (of mercury)
How are differences in air pressure created? The earth is unevenly heated. This temperature difference causes areas to have more or less dense air above different surfaces. The air then will either rise or sink, creating less/more pressure on Earth below.
Describe an area of high pressure. An area of high pressure has cooler air than the air surrounding it. Because of this difference in temperature, the cool, denser air sinks. This does not allow water vapor to rise easily to form clouds and creates sunny/clear sky conditions.
Describe an area of low pressure. An area of low pressure has a warmer temperature than the surrounding air. Because of this difference in temperature, the warm, less dense air rises. The warm air rising contains water vapor that will eventually cool and lead to cloud formation.
Why is the air pressure at the equator almost always lower than air pressure at the poles? The equator receives direct sunlight all year round. This leads to warm temperatures. Warm air is less dense and rises, creating an area of low pressure. This is also why there are more storms along the equator.
Why are the H's on weather maps blue? The H's represent areas of cool, sinking air creating areas of high pressure
Why are the L's on weather maps red? The L's represent areas of warm, rising air creating areas of low pressure
What causes differences in air pressure? Unequal heating of the earth causes differences in air temperature, which causes differences in air pressure.
Why does the temperature increase in the stratosphere? The ozone molecules that make up the ozone layer absorb some of the heat radiated from the sun.
Created by: Mrs.Koch