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6th Grade

6th grade Atmosphere Unit

Troposphere Layer in which we live, weather occurs here
Stratosphere Gases are found in layers, ozone layer is found here
Mesosphere Coolest layer, meteors burn up in this layer
Thermosphere Highest temperatures, contains the ionosphere
Atmosphere The mixture of gases which surround our planet; mostly nitrogen and oxygen
Weather The state of the atmosphere at a place and time
What is the most abundant gas in the atmosphere? Nitrogen
Global winds Winds that follow regular patterns and paths
Sea Breeze During the DAY cool dense air moves from the ocean towards the warm, less dense shore.
Land Breeze During NIGHT, cool dense air moves from the land towards the warm, less dense ocean.
Cumulus Fluffy, white clouds with flat bottoms.
Stratus Layered clouds which block out the Sun. Can cause constant drizzly rain.
Cirrus Small, wispy clouds created by strong winds. They often indicate a change in weather.
Condensation The change of water vapor to liquid water due to cooling; where clouds form
Precipitation Water returning back to Earth's surface: hail, sleet, snow, and rain
Global Warming The gradual increase of Earth's atmospheric temperature
Greenhouse effect The trapping of heat in the Earth's atmosphere due to an increase in 'greenhouse gases' (CO2)
Cold front When a cool air mass comes in and pushes a warm air mass up; results in cool weather
Warm front Warm air moves over cold, dense air. Results in drizzly rain and warm temperatures
Occluded front Warm air is trapped between 2 cool air masses; warm air rises up. This creates cool temperatures and lots of snow.
Stationary front When a warm and cold air mass meet, but neither can overpower the other. Results in days of cloudy weather & rain
Air mass A large mass of air which has similar temperature and water vapor content
Wind The movement of air caused by temperature differences
How does wind move? From high pressure to low pressure
Mountain & Valley Breezes Caused by the elevation and temperature differences
Humidity Amount of water vapor in the air
Dew Point Temperature where air cools to saturate it
Isobars Lines on a weather map that connect air pressure