Environmental Science
The earth's first atmosphere was composed primarily of:

Oxygen and water vapor
Argon and nitrogen
Hydrogen and helium
Carbon dioxide and water vapor

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Environmental Science
What is meant by ex-situ conservation?

Conservation of forest eco system
Conservation of plants
Conservation of a species by protecting its habitat along with all other species living there
Conservation of a species outside its natural habitat

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Environmental Science
The wind-chill factor:

Relates body heat loss with wind to an equivalent temperature with no wind
Tells farmers when to protect crops from a freeze
Takes into account humidity and air temperature in expressing the current air temperature
Indicates the temperature at which water freezes on exposed skin
Determines how low the air temperature will be on any given day

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