Cycles of Nature

An online crossword puzzle with 16 words. Play it free at AgileCrosswords.com.

Clues

• the gradual heating of the atmosphere caused by air pollution which traps energy from the sun
• formed by the interaction of organisms with their physical environment
• the introduction of harmful substances or products into the environment:
• rain containing acids that form in the atmosphere when industrial gas emissions combine with water
• nonliving
• The capacity or power to do work
• the layer of the upper atmosphere where most atmospheric ozone is concentrated
• Use by green plants of the energy in sunlight to carry out chemical reactions
• a byproduct of respiration
• part of the earth's atmosphere lying outside the troposphere
• an exhalation of air; breathing.
• these produce carbon dioxide when burned
• An organism that feeds on and breaks down dead plant or animal matter
• gaseous envelope surrounding the earth
• involving the food relationship of different organisms in a food chain.
• relating to living organisms

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