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s <br />1 <br />Heat Index of 130°F or Higher: <br />Heatstroke/sunstroke highly likely with <br />continued exposure <br />Heat Index of 105°F -130°F: <br />Sunstroke, heat cramps, and heat exhaustion <br />likely and heatstroke possible with prolonged <br />exposure and/or physical activity <br />Heat Index of 90°F -105°F: <br />Sunstroke, heat cramps, and heat aAhaustion <br />with prolonged exposure and/or physical <br />activity <br />Heat Index of 80°F -90°F: <br />Fatigue possible with prolonged exposure <br />and/or physical activity <br />g. Erosion <br />1) Soil Erosion <br />Soil erosion is the deterioration of soil by the physical <br />movement of soil particles from a given site. Wind, <br />water, animals, and the use of tools by man may all <br />be reasons for erosion. The two most powerful <br />erosion agents are wind and water but in most cases <br />these are damaging only after man, animals, insect s, <br />diseases, or fire have removed or depleted natural <br />vegetation. Accelerated erosion caused by human <br />activity is the most serious form of soil erosion, and <br />can occur so rapidly that surface soil may sometimes <br />be blown or washed away down to the bedrock. <br />Undisturbed by man, soil is usually covered by shrubs <br />and trees, dead and decaying leaves, or a thick mat <br />of grass. Whatever the vegetation, it protects the <br />soil when rain falls or wind blows. Root systems of <br />plants hold soil together. Even in drought, the roots <br />of native grasses, which extend several feet into the <br />ground, help tie down the soil and keep it from <br />blowing away. With its covering of vegetation <br />stripped away, soil is vulnerable to damage. Whether <br />the plant cover is disturbed by cultivation, grazing, <br />deforestation, burning, or bulldozing, once the soil is <br />Indian River County Comprehensive Emergency Management Plan Basic Page 17