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Weather
8th Grade Weather general weather topics, ranging from observation to prediction
Question or Term | Answer or Definition |
---|---|
What is air made up of? | Nitrogen 78%, Oxygen 21%, and 1% of other gasses. |
Why are nitrogen and oxygen necessary for life on Earth? | Plants need nitrogen, and most animals and plants need oxygen. |
Precipitation | Any form of water that falls from clouds to the ground. |
Why does precipitation occur? | Water particles condense into clouds and when the water falling speed is greater than the updraft force, precipitation falls. |
Types of precipitation | rain, snow, freezing rain, sleet, and hail |
Air pressure | ~result of air weight pushing down on an area ~normal air pressure is 14.7 pounds/square inch ~measured with barometer |
Low pressure | ~stormy/cloudy weather ~attracts fronts |
High pressure | ~fair, sunny weather |
Barometer | measuring tool for air pressure |
What are the four main divisions of air masses? | Tropical and Polar, and Maritime and Continental |
What types of air masses affect the U.S.? |