18 terms

Terms	Definitions
Ozone	Form of oxygen that combines three oxygen atoms into each molecule. Forms a protective layer that is crucial to life on Earth, protecting us from harmful UV radiation.
Troposphere	The bottom layer of the atmosphere, where temperature decreases with an increase in altitude.
Stratosphere	The second to the bottom layer of the atmosphere, where temperature remains constant to a height of about 20 km. This is where you can find the ozone layer.
Mesosphere	The third layer of the atmosphere, where temperature decreases with height.
Thermosphere	The last layer of the atmosphere where there is only a tiny fraction of atmosphere and temperature increases with altitude.
Summer Solstice	First official day of summer. The sun is vertical at Latitude 23.5° N, so the Northern Hemisphere leans towards the sun.
Winter Solstice	First official day of winter. The sun is vertical at Latitude 23.5° S, so the Northern Hemisphere leans away from the sun.
Autumnal Equinox	First day of Autumn. The sun is vertical at the equator.
Spring Equinox	First day of Spring. The sun is vertical at the equator.
Temperature	A measure of the average kinetic energy of the individual atoms or molecules in a substance.
Conduction	The transfer of heat through matter by molecular activity. The energy molecule is transferred by collision between molecules.
Convection	The transfer of heat by mass movement or circulation within a substance.;
Radiation	The transfer of energy through space by electromagnetic waves.
Reflection	Occurs when light bounces off an object.
Scattering	Produces a larger number of weaker rays from the sun that travel in different directions.
Greenhouse Effect	The heating of Earth's surface and atmosphere from solar radiation being absorbed and emitted by the atmosphere, mainly caused by water vapor and carbon dioxide.
Albedo	The fraction of total radiation that is reflected by any surface.
Isotherm	A line that connect points that have the same temperature.

Flickr Creative Commons Images

Some images used in this set are licensed under the Creative Commons through Flickr.com. Click to see the original works with their full license.

• "Ozone" image
• "Troposphere" image
• "Stratosphere" image
• "Mesosphere" image
• "Thermosphere" image
• "Summer Solstice" image
• "Winter Solstice" image
• "Autumnal Equinox" image
• "Spring Equinox" image
• "Temperature" image
• "Conduction" image
• "Convection" image
• "Radiation" image
• "Reflection" image
• "Scattering" image
• "Greenhouse Effect" image
• "Albedo" image
• "Isotherm" image

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