Environmental Science
Our seasons are caused by:

Only (b) and (c) are correct
All of these
The angle at which sunlight reaches the earth
The length of the daylight hours
The changing distance between the earth and the sun

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Environmental Science
How do red and blue light differ?

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

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