Topic 2 - Pollution and pesticides

WHAT IS POLLUTION

• pollutant= a substance that pollutes something, especially water or the atmosphere.

• Carbon monoxide comes from the burning of fuels with an insufficient supply of oxygen (when there is sufficient oxygen, carbon dioxide is formed).

•  Carbon dioxide comes from the combustion of fossil fuels with sufficient oxygen.

• Sulphur dioxide also comes from the burning of fuels, as most contain a little sulphur. It also comes from roasting metal ores and from volcanoes.

• Nitrogen oxides come from combustion engines during burning of fuels; in a car engine the temperature is high enough for nitrogen and oxygen from the air to react. They are also formed by lightning and bacterial action in the soil.

• Ozone is formed naturally in the upper atmosphere by the action of sunlight on oxygen, and at that height it…