Atmosphere Grade: «9th» Subject: Physical Science Date:

1Air pressure is measured in A milligrams B millibars C milliliters D square meters

2Percentage of oxygen in atmosphere: A less than 1 % B 21 % C 78 % D 99 %

3The layer that protects Earth from UV radiation A ozone B nitrogen C carbon dioxide D water

4Which atmospheric layer is the warmest A troposphere B stratospere C mesosphere D thermosphere

5Which atmospheric layer reflects radio waves A troposphere B stratosphere C mesosphere D thermosphere

6Gas that varies between 0 and 5 % is A nitrogen B oxygen C water vapor D carbon dioxide

7Photochemical smog is caused by chemicals reacting with A lightning B ozone C rain D sunlight

8Amount of mass in a given volume of material A density B pressure C weight D mass

9Harmful substance in air and water are called A soot B pollutants C particles D smoke

10As density of air increases, its pressure A increases B decreases C stays the same D doubles

11Which gas is the most abundant in the atmosphere? A oxygen B carbon dioxide C nitrogen D water vapor

12When coal and wood burn, carbon is released into the atmosphere as A dust B particles C smoke D soot

13How are the layers of the atmosphere classified A pressure B temperature C altitude D density

14_______ is measured by force per unit area. A density B weight C pressure D temperature

15Burning coal is one cause of acid rain, what does coal contain to cause this? A carbon dioxide B nitrogen C oxygen D sulfur

16The aurora borealis occurs in the ionosphere. True False

17Fires need nitrogen to burn. True False

18The air quality of the United States has been improving. True False

19Altitude describes the atmosphere at any given time. True False

20Air pressure decreases as altitude decreases. True False

21Find the amount of nitrogen and oxygen present in 1 liter of air. Units should be in milliliters

22. Cold air has a greater density than warm air. So why does a basketball not bounce as high when it is cold out? because the air becomes more dense inside the basketball. Air particles closer together. So ball is underinflated and less bouncy. Need to add more air 23. How can improving air quality lead to lower health costs? lead to lower respiratory allergies and respiratory problems and diseases. Less doctor visits, prescriptions, and medical care.

24. Compare and Contrast a mercury and aneroid barometer. both measure changes in air pressure. mercury has a tall glass tube that rests in a dish of mercury. air pressure pushes down on mercury in dish and forces mercury up in tube. aneroid barometer is air-tight chamber with thin flexible sides that move in and out with changes in air pressure

25. How is ozone good and bad for life on Earth? Good ozone is found in stratosphere - protects life from dangerous radiation from Sun bad ozone is caused by air pollution - dangerous to health, harms plants, and causes other kinds of damage 26. Why do pilots where oxygen masks at high altitudes? because air has low pressure and density. It makes it hard to breathe in enough oxygen

27. How could you used an inflated balloon to show decreasing volume results in an increase in pressure? Squeezing the balloon decreases the volume causing the air pressure to increase inside the balloon - balloon may burst