Weather and Climate

When a cold air mass forces a warm air mass up quickly, ______________.

• A warm front forms.
• The temperature rises.
• A short period of heavy rain follows.
• A high results.

When do hurricanes begin to lose their force?

• At night.
• During the day.
• When they move over land.
• When they move over warm water.

Hurricanes form when _______________.

• Air rotates within a thunderstorm.
• Warm air over the ocean begins to spin near the equator.
• A cold air mass forces a warm air mass to quickly rise. 
• Warm air is pushed up and over a cold air mass.

Lightning is caused by ________________.

• Thunder. 
• High temperature air mass colliding with a low temperature air mass. 
• High pressure systems.
• The separation of positive and negative charges within a large cloud. 

What organization collects and organizes weather data in the United States?

• The Public Broadcasting Association.
• The Weather Channel. 
• The National Weather Service. 
• The National Oceanic Administration.

In most of the United States and Canada, weather moves ________________.

• from west to east
• from east to west
• from north to south
• from south to north

Why do warm air masses go up and over cold air masses when they meet?

• Warm air is less dense. 
• Warm air is more dense.
• There is more moisture held in cold air masses. 
• Scientists do not yet know why this happens.

Which climate zone experiences cold winters and warm summers?

• Polar
• Temperate
• Tropical

Which zone has the highest temperatures and humidity year round?

• Polar
• Temperate
• Tropical

As you increase in altitude, the temperature _____________ and the pressure _____________.

• increases, increases
• increases, decreases
• decreases, increases
• decreases, decreases