Science: Earth and space: Test 7

At the equator, air rises and begins traveling outward, toward the poles. Why does the air sink back to Earth long before it before it reaches the poles?

• The air is heated by high temperatures at high altitudes
• The air is heated by compression as it rises
• The air is cooled by expansion as it rises
• The air is cooled by low temperatures at high altitude

The U.S. government broadcasts the official time for the country using a shortwave radio station in Colorado. How can these broadcasts be heard throughout the Lower Fourty-Eight United States?

• Radio waves follow the curve of the earth
• Radio waves can travel an unlimited distance
• Radio waves bounce off the ionosphere
• Radio waves travel in a straight line

Why do Cyclones in the Southern Hemisphere rotate the opposite direction from cyclones in the Northern Hemisphere?

• The earth’s tilt bends the wind in different directions
• The earth’s tilt changes the amount of insolation
• The Coriolis effect changes the amount of insolation
• The Coriolis effect bends the winds in different directions

why is afternoon usually the warmest part of the day?

• Trapped heat remains in the atmosphere
• The sun is almost directly overhead
• Earth does not radiate heat during the day
• Afternoon clouds warm the ground

why does a compass always point north?

• The compass points toward the North Star
• The compass points toward Earth’s magnetic poles
• The compass points away form the equator
• The compass point away from Earth’s core

what is the most important and aboundant greenhouse gas?

• Oxygen
• Water vapor
• Carbon dioxide
• Nitrogen

which atmospheric layer is the least understood?

• Mesosphere
• Stratosphere
• Stratopause
• Tropopause

which type of current causes most of the earth’s weather?

• Conduction current
• Convection currrent
• Radiation current
• Electromagnetic current

which temperature layer of the atmosphere contains the ozone layer?

• Thermosphere
• Stratosphere
• Stratopause
• Tropopause

what is the coldest point in the atmosphere?

• Turbopause
• Tropopause
• Stratopause
• Mesopause