Environmental Science
Heat is energy in the process of being transferred from:

Low pressure to high pressure
Hot objects to cold objects
High pressure to low pressure
Regions of low density toward regions of high density
Cold objects to hot objects

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Environmental Science
During the winter solstice in the Northern Hemisphere:

Astronomical winter begins in the Northern Hemisphere
The noon sun is overhead at 23.5o S latitude
All of these
At middle latitudes in the Northern Hemisphere, this marks the longest night of the year

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Environmental Science
How do red and blue light differ?

Blue light has a higher speed of propagation.
Red light has a higher intensity.
The wavelength of red light is longer.
Red and blue light have different directions of polarization.

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Environmental Science
Much of Tibet lies at altitudes over 18,000 feet where the pressure is about 500 mb. At such altitudes, the Tibetans are above roughly:

50% of the air molecules in the atmosphere
75% of the air molecules in the atmosphere
25% of the air molecules in the atmosphere
10% of the air molecules in the atmosphere

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