Environmental Science
What is the name of the action plan for sustainable development in the Twenty first century framed in the Rio Declaration on Environment & Development (1992)?

Action 21
Agenda 21
Declaration 21
Rio 21

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Environmental Science
Thermal belts are:

Cold, below-freezing air found at the top of a mountain
Warmer hillsides that are less likely to experience freezing conditions
Pockets of cold air resting on a valley floor at night
Pockets of warm air resting on a valley during the afternoon

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