Section 1
The percentage of oxygen in the atmosphere...
What is 21%
The amount of mass in a given volume of a substance is its...
What is density?
The warmest layer of the atmosphere is...
What is thermosphere?
Photochemical smog is caused by the action of this on pollutants...
What is sunlight?
How could you use an inflated balloon to show that decreasing the volume of a fixed mass of air increases its pressure?
One possible way is to decrease the volume of air of the balloon by squeezing the balloon. As the volume decreases, the air pressure increases, causing the balloon to burst.
A gas in the atmosphere that varies in different places and from time to time is...
What is water vapor?
As the density of air increases, its pressure ....
What is decreases?
The layer of the atmosphere that reflects radio waves is the...
What is the thermosphere (ionosphere)?
Harmful substances in air, water, or soil are called...
What are pollutants?
What must pilots wear oxygen masks when they fly at very high altitudes?
The air has very low pressure and density at high altitudes. This makes it hard to breathe in enough oxygen without an oxygen mask.
The most abundant gas in the atmosphere...
What is nitrogen?
Air pressure is often measured in ...
What are millibars?
The stratosphere helps protect Earth from too much ultraviolet radiation because this layer of the atmosphere contains...
What is ozone?
Particles of carbon that enter the air when wood or coal are burned are called...
What is soot?
How can ozone be both good and bad for life on Earth?
Ozone in the stratosphere is good because it protects Earth's surface from dangerous ultraviolet radiation from the sun. Ozone in the troposphere, caused by air pollution, is bad because it damages people's health, harms plants, and causes other kinds of damage.
The condition of Earth's atmosphere at a particular time and place...
What is weather?
The force per unit area is...
What is pressure?
The four main layers of the atmosphere are classified according to changes in...
What is temperature?
One cause of acid rain is the burning of coal that contains a lot of ...
What is sulfur?
How might improving air quality lead to lower health costs?
Improving air quality would lead to fewer respiratory allergies and other respiratory problems and diseases. This, in turn, would lead to fewer doctor visits, prescriptions, and other medical care and thus reduce health costs.
Fire needs this to burn...
What is oxygen?
Air pressure decreases as altitude ...
What is increases?
Auroras occur in the...
What is ionosphere?
Over the past 3o years, air quality in the U.S. has generally...
What is improved?
Who is going to do amazing on this test?
I am!!!