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Study Guide Chapter 17
Atmosphere
30
Environmental Studies
9th Grade
02/07/2013

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Cards

Term
What produces a variety of weather ?
Definition
Combination of Earth's motions and energy from the sun
Term
What is climate based on ?
Definition
Climate is based on observations of weather that have been collected over many years. Climate helps describe a place or region.
Term
What is air a mixture of ?
Definition
Air is a mixture of different gases and particles each with its own physical properties. The composition of air varies from time to time and place to place
Term
What two gases make up 99 percent of dry air ?
Definition
Nitrogen and oxygen make up 99 percent of the volume of clean, dry air
Term
What gas plays a significant role in heating the atmosphere ?
Definition
Carbon dioxide is an active absorber of energy given off by Earth. Therefore, it plays a significant role in heating the atmosphere
Term
What is the source of all clouds and precipitation ?
Definition
Water vapor is the source of all clouds and precipitation. Like carbon dioxide, water vapor absorbs heat given off by Earth. It also absorbs some solar energy
Term
What are some particles that remain suspended for long periods of time ?
Definition
Sea salts from breaking waves, fine soil blown into the air, smoke and soot from fires, pollen & microorganisms lifted by the wind, & ash & dust from volcanic eruption
Term
When do oxygen atoms split into single atoms of oxygen ?
Definition
They split when they absorb ultraviolet radiation emitted from the sun
Term
What does ozone absorb ?
Definition
Ozone absorbs harmful UV radiation from the sun. Our planet would be uninhabitable for many living organisms if ozone wasn't there
Term
What accounts for nearly half the primary pollutants by weight ?
Definition
Emissions from transportation vehicles
Term
What are secondary pollutants ?
Definition
They are not emitted directly into the air. They form in atmosphere when reactions take place among primary pollutants and other substances
Term
What are photochemical reactions ?
Definition
Reactions triggered by strong sunlight
Term
What is atmosphere pressure ?
Definition
Atmosphere pressure is simply the weight of air above
Term
How many layers is the atmosphere divided into ?
Definition
4
Term
In what layer do most weather phenomena occur ?
Definition
Troposphere
Term
Where does most energy that drives weather and climate come from ?
Definition
Sun
Term
What crates winds and dives the ocean's currents ?
Definition
It is the unequal heating of Earth that creates winds and drives the ocean currents. These movements transport heat from the tropics toward the poles in an attempt to balance energy differences. The results of these processes are the phenomena we call weather .
Term
What is rotation ?
Definition
Rotation is the spinning of Earth about its axis. The axis is an imaginary line running through the north and south poles. Our planet rotates once every 24 hours, producing the daily cycle of daylight and darkness
Term
What is revolution ?
Definition
Revolution is the movement of Earth in its orbit around the sun. Earth travels at nearly 113,000 kilometers per hour in an elliptical orbit about the sun
Term
What are the degrees the Earth is tilted ?
Definition
23.5 degrees
Term
What is length of daylight determined by ?
Definition
It is determined by Earth's position in orbit.
Term
What are the three mechanisms for energy transfer ?
Definition
Conduction, convection & radiation
Term
What can radiate energy travel through ?
Definition
Radiant energy can travel through the vacuum of space
Term
Do hot or cold objects radiate more energy ?
Definition
Hotter objects radiate more total energy per unit area than colder objects do
Term
What is reflection ?
Definition
Reflection occurs when light bounces off an object. About 30% of the solar energy reaching the outer atmosphere is reflected back to space
Term
Does land or water heat to higher temperature faster ?
Definition
Land heats more rapidly and to higher temperatures than water. Land also cools more rapidly and to lower temperatures than water. Temperature variations, therefore, are considerably greater over land than over water.
Term
What is a coast called in which winds blow from the ocean onto the shore ?
Definition
Windward
Term
What is albedo ?
Definition
Albedo is the fraction of the total radiation that is reflected by any surface. Many clouds have a high albedo and therefore reflect a significant portion of the sunlight that strikes them back to space
Term
What does the extent of cloud cover influence ?
Definition
By reducing the amount of incoming solar radiation the maximum temperatures on a cloud -covered day will be lower than on day when the clouds are absent and the sky is clear.

At night, clouds have the opposite effect. Clouds act as a blanket by absorbing outgoing radiation emitted by Earth and reradiating a portion of it back to the surface. Thus cloudy nighttime air temperatures do not drop low as they would on a clear night. The effect of cloud cover is to reduce the daily temperature range by lowering the daytime maximum and raising the nighttime minimum .
Term
What type of lines connects points of the same temperature ?
Definition
Isotherms
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