Sun
What is the source of heat for the Earth?
the sun is the only source of heat
what 3 things happen to most of the heat radiated from the sun and that enters the earths atmosphere? state percentages in your answer
34% is reflected away by clouds
19% is absorbed by the atmosphere
47% is absorbed by the earth's surfaces.
what is weather
the condition of the air around the earth.
We have studied 2 factors of weather. what are they?
Hint - This is about WEATHER, not temperature.
Air pressure
temperature
What does heat radiated back from the earth do?
warms the atmosphere
Explain how the Earth atmosphere acts like a greenhouse.
A greenhouse lets in light and prevents heat from escaping. The light warms the plants, and encourages their growth. The heat encourages the survival and growth of organisms (plants). The atmosphere prevents most of the heat from escaping and getting lost in space.
what is latitude
imaginary parallel lines that encircle the earth.
what is the latitude of the equator?
what and where is the Tropic of Cancer? when does it receive the most radiation?
line of latitude. 23.5 degrees north
receives most radiation on June 21
what is the Tropic of Capricorn? where is it? when does it receive the most radiation?
line of latitude. 23.5 degrees south.
receives most raditiation on December 22
What is the Artic Circle? where is it? describe how it is impacted by sunlight
66.5 degrees north. remains in the earths shadow and receives no daylight at all. On June 21, when the north pole is tilted forward, the Artic Circle enjoys 24 hour of sunlight because the sun does not set. On December 21, the sun does not rise at all.
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What is the Antarctic Circle? where is it? describe how it is impacted by sunlight
66.5 degrees north. On December 22, when the sun does not set. On June 21, the sun does not rise at all.
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what is the Twilight Zone? what does it cause?
Bordering the sunlit side is a narrow zone called the Band of Twilight, which is illuminated by scattered or refracted light.
Gives us sunsets and sunrises
The Twilight Zone happens because some of our sunlight refracts (curves) around the earth even when the sun is just out of sight.
what is the very top of the sky called?
Zenith
The sun's position is the sky is related to the horizon and the zenith.
What is the longest day of the year that also has the shortest night.
Summer Solstice (June 21) - The first day of summer.
On what day and night are of equal length?
Autumnal Equinox (September 22) - The first day of fall.
What day is the shortest day of the year with the longest night.
Winter Solstice (December 22) - The first day of winter.