The blanket of air that covers and surrounds our planet. Earth's atmosphere makes it possible for life to exist. It contains helpful gases that plants, animals, and people need to live. The atmos [..]

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A huge volume of air, sometimes hundreds (or thousands!) of miles wide. An air mass has about the same temperature and water vapor everywhere inside the bubble. Sometimes they're warm and sometim [..]

A simple instrument used to measure how strong or weak the air pressure is. You can't see air pressure, but it is all around us every day. Scientists use barometers to help predict the weather. W [..]

The climate where you live is made up of all the different weather patterns that usually happen there. Once you get to know the average weather conditions of a place for a long period of time, then yo [..]

Clouds are made up of many, many tiny drops of water. Sometimes they are also full of frozen ice crystals. Clouds form when water drops condense from the atmosphere. They can be big and puffy or thin [..]

The leading edge of a cold air mass. It's called a front because all of the cooler air mass is behind it. Cold fronts usually start near the North Pole or South Pole and then keep moving until th [..]

A cyclone is a warm air mass that rotates around a center of strong low pressure. Typhoons and hurricanes are both types of cyclone. If the cyclone forms over the Atlantic Ocean or eastern Pacific Oce [..]

A major weather pattern that starts in the Pacific Ocean. An El Niño happens when warm water near the equator gets blown across the ocean by tropical winds and ends up next to South America, Mexico, a [..]