GLOSSARY (R-S)

renewable resources - resources such as water, air, trees, fish, and products from the soil that if properly maintained will last forever

salinization - the accumulation of salts in a soil which has experienced improper irrigation practices

selective logging - a practice of the forestry industry where only a select number of trees in a stand are cut instead of the whole stand being cut

shantytown - an area of makeshift housing around the outskirts of a city where the poor and landless attempt to take up residence

sharecropper - a farmer who pays for renting his small piece of land with a portion of his crop grown on the land

stratosphere - the layer of the atmosphere above the troposphere extending up to 50 km - temperatures in this layer remain relatively constant - the ozone layer is found within this layer

subsidies - cash or other incentives given to a producer of goods that the government would like to attract to another area or maintain in its established location

subsistence agriculture - a type of farming where all or most of the produce is used to feed the household or village where very little is sold at market

succession - the processes in an ecosystem where one plant community changes to another - it will eventually lead to a stable climax ecosystem

sustainable development - development which does not interfere with the ecological systems of an area - the establishment of industries/habitation should be planned to minimize their damaging effects