the amount of particles in a given amount of matter and how closely packed together they are

the weight of the gases that make up the Earth’s atmosphere

a line on a weather map to show points that have the same air pressure

a large horizontal volume of air in the atmosphere that is mostly even in temperature and moisture

Use data from the weather map to predict how the weather in certain areas would affect outdoor activities. The numbers by the cities indicate the highest and lowest temperatures in the area. Which city's weather would most likely affect outdoor activities?

Use the map to predict the best route from Bigfoot Airfield, WI, to Black Hills Airport, SD.

What type of winds would be expected on Route A?

What type of winds would be expected on Route B?

What type of winds would be expected on Route C?

Select the air masses that fit the observation: 'Relative humidity can't get high enough for precipitation to occur. Dew point is too low.'

Select the air masses that fit the observation: 

"Precipitation only forms at low atmospheric pressure. Precipitation occurs when relative humidity reaches 100%. This happens when the air temperature drops to reach the dew point. Rain is formed when the temperature is above freezing. Snow is formed when the temperature is below freezing."

A meteorologist observed the interaction of the following air masses on a day with high levels of moisture in the air. When the air masses shown in the picture interact, which front is most likely to occur? 

A meteorologist observed the interaction of the following air masses on a day with high levels of moisture in the air. Which weather conditions are most likely to occur? Select all that apply.  

Keira is planning a hiking trip in Vermont. On her last hike, she collected data on the relationship between altitude and atmospheric pressure. Describe the relationship between air altitude and air temperature.

Keira is trying to decide which of the following mountains she should climb. She wants to have a comfortable picnic at the top of whichever mountain she climbs. Based on the data, which mountain peak is likely to be the warmest?