(b) 29.53 inches (c) 996 mb (millibars) 2 mb (The answer must include units.) 19. (a) As moist air rises, it expands and cools below the dew point. That causes a cloud to form. (b) Condensation or freezing (crystallization)
10
Reviewing Earth Science Answer Key
21. Indirect, inverse or as altitude increases, air pressure decreases.
22.
13. hurricane 14. (a) The cold front must run along or be immediately adjacent to the area of clouds and precipitation.
(b) A high is a single, spreading air mass. The pressure gradient is small. Air is generally sinking toward the ground within a high. (c) Accept eastward; toward the east; west to east 15. (a) 15 knots, (from the) southwest (b) 1014.6 millibars (mb) (c) Accept 6 or 7°C (d) There is smog or air pollution 16. cold and moist, cool and humid 17. As cloud height increases, so does the probability of hail. Direct 18. stratosphere 19. 1 day 20. Acceptable answers include seek shelter, avoid going out in a car, stay away from windows. 21.
22. cold front 23. The air is relatively low in density. Condensation warms the air and lowers its density. 24. Condensation or freezing 25. The Atlantic Ocean or the Gulf of Mexico 26. increasing pressure Reviewing Earth Science Answer Key
11
27. 1020.1 mb (millibars)
34.
28. Accept any two. The dew point and air temperature are close together. The sky is overcast. Air pressure is relatively low. Air pressure has been decreasing. 29.
(Note: The wind speed feathers may be placed on either side of the staff.) 30. 999.8 mb and 1001.0 mb three hours before
35. The Gulf of Mexico or the (South) Atlantic ocean
31. Toward the East or southeast (Accept from the west or northwest.)
36. gradient =
change in field value distance 1600 inches − 80 inches = 20 miles 80 inches = 20 miles = 4 inches/mile (± 0.2 inches/mile)
change in field value change in diistance 1016 mb − 1000 mb = 1000 km 16 mb = 1000 km = 0.016 mb/km (± 0.001 mb/km)
32. gradient =
(The correct units must be given.) 33. Less water evaporates from Lake Erie after it freezes over. Ice cover reduces the air humidity as it comes off Lake Erie. Lake Erie gives the air less energy when it is frozen.
37. The isobars are far apart. The pressure gradient is low. It is the center of an anticyclone. 38. (Lowest) Albuquerque, New York City, Chicago (Highest) 39. inward and counterclockwise curving toward the left 40. 1014 mb (1 mb) 41. 1022 mb (1 mb) 42. 30 knots from the northwest 43. warm
45. Precipitation was greatest where air was rising into the Catskills. Mountains generally get more snow.
CHAPTER REVIEW QUESTIONS
46. Buy extra food and supplies. Be sure they have enough fuel to heat their homes for several days. Evacuate anyone likely to need medical attention. Recharge cell phones.
PART C 21. 5°C (The response must include the number and the units.) 22. City X is inland, far from an ocean or large body of water. City Y is a coastal city. 23. Both cities have their highest temperatures during the Northern Hemisphere summer. 24. Water has a higher specific heat than land.
Reviewing Earth Science Answer Key
13
25.
31. 60° (above the horizon) 32. The California Current makes point B cooler.
May 9 Average Date of First Ice Breakup
May 8 May 7
33. 60° North
May 6
34. As air sinks, its relative humidity decreases. The winds blow to a lower elevation and become warmer as they enter the valleys. Clouds evaporate as the winds descend into the valleys.
May 5 May 4 May 3 May 2 May 1
35. Accept answers in the range from 30 to 35 inches. (The units must be included.)
April 30 April 29 April 28
36. As air rises, expansion causes cooling. The summit is higher than nearby locations.
April 27 1960– 1969
1970– 1980– 1979 1989 Decade
1990– 1999
37. Death Valley 38.
26. The climate was getting warmer. 27.
X
28. Rotation, or spin on its axis 29. Carbon dioxide
(The dotted part of the outline is optional.) 39. Allegheny Plateau
30.
40. New York City 41. The St. Lawrence River, Lake Champlain and the Hudson River 42. Oswego River or St. Lawrence River 43. The Labrador Current makes the temperatures lower, or cooler. 44. The air is sinking; cold air can hold little water vapor. 48. 45. conduction 46. radiation 47. convection 14