Mathematics and Society - OS X Lion Server

ENVIRONMENT GLOSSARYgra-watgram. A unit of mass. A ra1S1n hasa masS of about 1 gram, a tennisball, about 50 grams. Symbol: ghectare. A unit of area equal to10,000 square metres. Symbol: hahydrocarbons. Usually, unburnedpetroleum products in the air. Notharmful in small amounts, but reactwith sunlight to form one kind ofsmog.hydroelectricity. Electricity producedby water power.immigration.or regionoincinerate.Movement into a countryTo burn.insecticide. Any chemical substancethat kills insects.inversion. What happens when a layerof cool air is trapped by a layer ofwarm air above it. Air pollutioncan't escape when an inversion occurs.kilocalorie. 1000 calories.Symbol: kcallitter. 1. Trashscattered around.at one birth (theof 5 puppies).or garbage2. The offspringdog had a litterparticulates. In the air, very smallpieces of matter. They reduce visibilityand contribute to some lungdiseases.pesticides. Any chemical substancethat kills plant or animal pests.pollutant.pollution.Something that causespollution. Whatever makes the environmentunfit or undesirable for living.population. The total number of peoplein a region; can also apply to animalsor plants (the rat population was outof control).produce. (In groceries) fresh fruitsand vegetables.recycle. To use over again after it isth,oloffi away.salvage,smog.2.ingTo save from rubbish.Secchi disk. A black and white diskused to measure how cloudy water is.1. A mixture of smoke and fog.The haze caused by sunlight reactwithair pollutants.soil compaction.soil is.How packed-down the(\(\litre, A cubic decimetre, or 1000cubic centimetres. Symbol: lsolid waste.liquid form.All waste not in a gas ormetric tonne.Symbol: tmicrogram.Symbol:nitrogen oxides. Gases from carsor burning that help form smog.noise.m).l1000 kilograms.One millionth of a gram.Unwanted sound.species. A category in a classificationsystem of living things. Humansall belong to the Homosapiens species.sulfur oxides. A kind of gas in someair pollution. It reacts witn waterin the air to make an acid.thermal.Caused by heat.water cycle. The constant change ofground water to vapor to clouds to rain (/and back to ground water. \250