Weather

Which has the greatest effect on wind speed?

• precipitation

• cloud cover

• wind direction

• air pressure

Which is the best explanation for how air masses move across the United States?

• The prevailing westerlies move air masses from west to east across the United States but may be deflected by the jet stream.

• The trade winds move air masses from west to east across the United States.

• The jet stream moves air masses from the Pacific Ocean across the United States.

• The warm air of the Gulf Stream causes air masses to move from the Atlantic Ocean to the Pacific Ocean.

What is the cause of rising surface temperatures of the Pacific Ocean, drought in the western United States, and flooding on the Pacific coast of South America?

• the jet stream

• El Nino

• La Nina

• the gulf stream

What will most likely result when the jet stream moves south of North Carolina?

• North Carolina will experience tropical weather conditions.

• North Carolina will experience hot, dry weather.

• North Carolina will experience mild weather.

• North Carolina will experience cold weather.

Which best describes a characteristic of the jet stream?

• It forces the hot air along the equator to rise to areas in North America.

• It creates the high winds around the eye of the hurricane.

• It forms a boundary between a cold air mass and a warm air mass.

• It causes high pressure air masses to rotate clockwise.

Which best describes why winds at the beach change direction between day and night?

• because the temperatures over land and over water change

• because warm air over land sinks and stays in place over land

• because cool air rises and is replaced by warm air from the ocean

• because cool air sinks and stays in place over land

The weather forecast indicates that a warm front will be moving into the area in the next 24 hours. Which type of weather will most likely result?

• clear skies and hot temperatures

• clear skies and cold temperatures

• heavy snow and ice

• cloudy skies and rainy weather

Which will most likely result from a low-pressure weather system?

• warm temperatures

• cool temperatures

• cloudy conditions

• clear conditions

On a cold, cloudy day, the local weather forecaster predicts that a high-pressure system will be moving into the area in the next 24 hours. Which weather conditions will this system most likely bring to the area?

• stormy

• hot

• sunny

• snowy

One morning, Jane notices drops of water on the outside of a window. Later in the day, she notices that the drops have disappeared. What most likely caused the drops to disappear?

• The water condensed on the plants around the house.

• Energy from the sun caused the water to evaporate.

• The water cooled enough to turn into water vapor.

• Wind blowing on the window turned the water into vapor.