Environmental Science
At what time of day is the relative humidity normally at a minimum?

When the air temperature is lowest
Just before sunrise
When the air temperature is highest
About midnight

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Environmental Science
The earth is tilted at an angle of 23.5o with respect to the plane of its orbit around the sun. If the amount of tilt were increased to 40o, we would expect in middle latitudes:

No appreciable change from present conditions
Cooler summers and colder winters than at present
Cooler summers and milder winters than at present
Hotter summers and milder winters than at present
Hotter summers and colder winters than at present

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Environmental Science
How do red and blue light differ?

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

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