Environmental Science
When a liquid thermometer is held in direct sunlight,

It will accurately measure the air temperature
It will measure a much lower temperature than that of the air
It will measure a much higher temperature than that of the air
It will measure the temperature of the sun rather than the air

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Environmental Science
The aurora is produced by:

Reflections of sunlight by polar ice fields
Burning oxygen caused by the intense sunlight at high altitude
Scattering of sunlight in the upper atmosphere
Fast-moving charged particles colliding with air molecules
The combination of molecular and atomic oxygen to form ozone

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Environmental Science
Frost forms when:

Water vapor changes into ice without first becoming a liquid.
The dew point is 32oF or below.
All of these
Objects on the ground cool below the dew point temperature.

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