ENVS195 Lecture Notes - Lecture 7: Waterfront Toronto, Animal Husbandry, Food Security
7 Dec 2015
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Document Summary
Under natural conditions, movement rates between components achieve a balance over time. Human activities speed up transference between cycle components. Many pollution problems result from human induced accumulation in one or more components of a cycle. It is too great for natural systems to dissipate. Essential for life processes in plants and animals. Relatively rare on earth"s surface dominant limiting factor. Plants: developing healthy seeds, root growth and stem strength. It works with calcium to build bone tissue. Unlike carbon, phosphorus is not stored as a gas in the atmosphere. It is stored in rock and sediments on the ocean floor. Phosphorus is released from rock into the soil by a process called weathering: Weathering: rock breaks down into smaller pieces. the pieces make their way into the soil. Plants take up phosphates through their roots, animals eat the plants, and decomposers return it to the soil.
