Thermal Pollution & Erosion
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Thermal Pollution & Erosion
Unit 7-5 NotesMr. Hefti – Pulaski Biology
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The steam is not radioactive.The issue here is all thermal.
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Thermal Pollution ► What is it?
• Power plants and industries use water from lakes or rivers as a coolant but return it to the environment at a higher than normal temperature
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TP ► What causes it?
• Cold water is taken from great depths and returned warmer
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TP ► Why is it bad?
• Species suffocate in the presence of warmer water–Warm water does not hold as
much oxygen as cold water• Some organisms move away• Contributes to algal and bacterial
growth
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TP ► What can be done about it?
• Find other uses for heated water
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Erosion ► What is it?• The process by which earth’s surface is
worn away by:–Water–Glaciers–Wind–Waves–Humans
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E ► What causes it?
•Deforestation•Overgrazing•Poor land
management
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E ► Why is it bad?
• Nutrient-rich soil is washed away• Sediments contaminate water
supplies• Desertification
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E ► What can be done about it?
• Planting trees • Cover crops• Wind breaks• Terrace farming• Runoff barriers• Rotate pastures