1.
A) a difference in wind direction and speed B) similar wind speeds and directions C) increasing rainfall D) thunder 2.
A) nimbus B) nimbostratus C) cirrostratus D) cumulonimbus 3.
A) a high pressure zone B) a storm C) a hurricane D) a front 4.
A) they know about them far in advance B) they often occur during lightening storms C) they last for extended periods of time D) there is often little warning before they occur 5.
A) Humidity B) Air pressure C) Saturation D) Relative humidity 6.
A) over a long period of time B) at a specific time and place C) at a specific temperature D) over a short period of time 7.
A) space B) air molecules C) snow D) small particles like dust and salt 8.
stationary front describes a front __________.A) that stops advancing B) that changes C) that continues forward D) that is present for a brief amount of time 9.
A) Earth's rotation B) the natural tendency of winds to blow from low to high pressure C) precipitation D) Earth's revolution around the Sun 10.
A) cool air because air molecules in cool air move fast B) warm air because air molecules in warm air move slowly C) cool air because air molecules in cool air move slowly D) warm air because air molecules in warm air move fast 11.
A) weak updrafts of warm, moist air B) strong updrafts of dry air C) strong updrafts of warm, moist air and sinking, rain-cooled air D) rain-cooled air 12.
A) relative humidity B) saturation point C) dew point D) evaporation point 13.
A) They help meteorologists tell how fast wind is blowing by noting how closely isobars are placed on a weather map. B) They help meteorologists predict dry weather. C) They help meteorologists see areas of equal temperature. D) They help meteorologists tell how fast wind is blowing by noting how far apart isobars are placed on a weather map. 14.
A) The Sun heats air in the atmosphere. B) The Sun evaporates water in the atmosphere to create clouds. C) all answers are correct D) The Sun heats water on Earth. 15.
A) an unknown number of B) two C) four D) three 16.
A) Tornadoes occur over sea and hurricanes occur over land. B) Tornadoes happen during winter and hurricanes happen in the summer. C) They are the same things. D) Tornadoes occur over land and hurricanes occur over sea. 17.
A) The atmospheric pressure suddenly rises. B) The relative humidity drops. C) Converging fronts collide. D) Different parts of a cloud become oppositely charged, and current flows between them. 18.
A) the composition of air molecules B) the direction of air molecules C) the arrangement of air molecules D) the average motion of air molecules 19.
A) rain B) snow C) hail D) sleet 20.
A) layers of even sheets in the sky B) puffy white clouds C) fog D) fibrous, or curly, clouds
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