Environmental Science
The earth's radiative equilibrium temperature is:

The average temperature the earth must maintain to prevent the oceans from freezing solid
The temperature at which the earth is absorbing solar radiation and emitting infrared radiation at equal rates
The temperature at which the earth is radiating energy at maximum intensity
The temperature at which rates of evaporation and condensation on the earth are in balance

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Environmental Science
Definition of ecosystem is

The abiotic component of a habitat
The community of organisms together with the environment in which they live
The part of the earth and its atmosphere which inhibits living organisms
A community of organisms interacting with one another

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Environmental Science
What is UNCED?

United Nations Conference on Environment and Development
None of these
United Nations Conference on Education,
United Nations Conference on Environmental Day

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