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Human Factors: Human factors are anthropogenic effects in the surrounding environment. Trees, pavement, buildings, piping; they are all place there by humans, and are created to meet the high standards the creator. However, they can also have some nocuous effects on the environment. These harmful factors include pavement, fire hydrants, litter, gravel roads or tracks, shade from obstructions, human use of an area, trees, and buildings. Pavement, for example, is made of Portland cement, gravel, and sand. The mixture is compacted, and then cooled. When poured and set, the pavement not only kills any growing organisms where it is placed, it also repels water. The rain will carry any dirt, chemicals, or other harmful material that collects on the pavement away. The grit will set in streams, possibly leading to soil erosion. The silt from the soil can cover the breeding grounds for fish. If the water cannot filter through the...

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