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