Environmental Science
High biological oxygen demand indicates:

absence of microbial pollution
moderate microbial pollution
all of these
intense level of microbial pollution

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Environmental Science
The albedo of the earth's surface is only about 4%, yet the combined albedo of the earth and the atmosphere is about 30%. Which set of conditions below best explains why this is so?

High albedo of clouds, low albedo of water
High albedo of clouds, high albedo of water
Low albedo of clouds, high albedo of water
Low albedo of clouds, low albedo of water

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Environmental Science
The north-facing side of a hill in a mountainous region in the US tends to:

Grow a variety of trees that are typically observed at higher elevation
All of these
Receive less sunlight during a year than the south-facing side
Be a better location for a ski run than the south-facing side
Have snow on the ground for a longer period of time in winter compared to the south-facing side

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