Pollution

Pollution

• 1.
  POLLUTION Control PopulationTo Control Pollution
• 2.
  The Earth givesus food, water, clothing and shelter. Human beings use the environment for different activities. Some of these activities pollute our environment. Most of the pollution that we face today is due to increasing population. Thus, human beings are greatest threat to the environment. Pollution is mainly of four major types: Air, Water, Soil and Noise pollution.
• 3.
  AIR POLLUTION Themixing of harmful gases and other particles in the air is called air pollution. Some of the substances which cause air pollution come from natural sources. Certain others come from man-made sources e.g. industrial chimneys. Sandstorms, volcanic eruptions, forest fires and pollens from plants and flowers are natural causes of air pollution.
• 4.
  WATER POLUTION Whenwater sources get polluted, it causes water pollution. Both fresh and salty water can get polluted. Sometimes underground water also get polluted. Water pollution is usually caused by human activities such as: Dumping wastes including harmful chemicals from factories Dumping household waste Leakage from oil tankers Water pollution harm the plants and animals that live in polluted water.
• 5.
  SOIL POLLUTION Thepollution of soil or land is caused when harmful substances are released into the soil or accumulate on the land. The main sources of soil pollution are: Solid wastes such as garbage Refuse from mines Refuse from forests and agriculture. Pollution makes the soil infertile. It harms the organisms living in the soil.
• 6.
  NOISE POLLUTION Thepresence of loud noises in the atmosphere is called noise pollution. Loud noises are harmful to all living things. The intensity of sound is measured in decibels. The softest sound we can hear is about 20 decibels. Any sound louder than 90 decibel is harmful for the ears. Rock music is more than 100 decibels.
• 7.
  The main causesof noise pollution are: Cars and bus horns Airplanes Loudspecers Machines in factories Loud music
• 8.
  DO YOU KNOWOn 24 march 1989, about 30 million gollons of crude oil was spilled into the sea, near alaska. It is known as the Exxon Valdez oil spill. It was one of the world’s worst environmental disaster. The oil spread over hundreds of kilometers. Thousands of sea creatures were killed.
• 9.
  ANANYA AGRAWAL apresentation by: