Earth’s Natural Radiation Balance
What process fuels the sun?
The electromagnetic spectrum ranges from
___________ to _____________.
Longwave radiation to shortwave
What is the difference between near infrared radiation and thermal
Near infrared reflects the solar radiation
Thermal shows heat
Using Wien's law, a typical Earth surface at about 17°C (290°K) emits
radiation at a peak of about ___________ What's the peak wavelength of
emission for the sun with surface temperature of about 6000°K?
Does a colder body emit more intense radiation than a hotter body?
Earth undergoes a revolution once every __________ on the plane of the
on the plane of the ecliptic
Earth is about 3 million miles closer to the sun in _________ (called
__________) than in __________ (called __________).
Closer in January (perihelion)
Farther in (July) Aphelion
Looking down at the North Pole, Earth rotates in a _____________
direction, once every ___________.
Once every 24 hours
How much does Earth's axis tilt?
Draw the equator, Tropic of Cancer, Tropic of Capricorn, Arctic Circle,
and Antarctic Circle, and label the latitudes.
Then, trace the location of the subsolar point throughout the year on this
drawing. Be sure to identify the location of the subsolar points on the
solstices and equinoxes.
Tilt changes what two key factors to cause seasons?
Short ________ and low ___________ are the cause of winter.
Solar elevation (sun angle) and the length
Short days and low elevation
What is the angle of the sun at noon at ASU on each equinox and each
What latitude(s) would you go to party all
long (24 hours) on
the Antarctic Circle
Where would you go to experience 12 hours of night and day every
single day of the year?
What times of year would all latitudes experience 12 hours of night and
What latitudes would experience the subsolar point twice in a year?
What latitudes would experience the subsolar point once in a year?
What latitudes would never experience the subsolar point?
all latitudes between the tropic of
Cancer and the Tropic of Capricorn
The Tropic of Cancer and the Tropic of
all latitudes poleward of the Tropics
If you are north of the Tropic of Cancer, the sun at noon would
in the _______ part of the sky, casting a shadow to the _________.
What gases make up more than 95% of Earth's atmosphere?
- nitrogen, oxygen and argon
What gas varies the greatest from place to place next to Earth's surface?
Dust particles have the tendency to change the temperature of Earth's
surface. In what direction? How do they do this?
Scatter solar radiation
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