Glossary

 __GLOSSARY__

A full list of glossary terms outlined for VCE Geography from VCAA can be found at:

http://www.vcaa.vic.edu.au/vce/studies/geography/geographysd.pdf and follow the contents page to page 27 for the glossary.

Human population definitions

Additional terms:
 * Fresh Groundwater**: less than 325 EC;
 * Marginal Groundwater**: more than 325 but less than 975 EC; at the limit of potable water, suitable for watering of livestock, irrigation and other general uses;
 * Brackish Groundwater**: salinity more than 975 but less than 3,250 EC; suitable for selective irrigation and watering of almost all livestock;
 * Saline Groundwater**: more than 3,250 EC; suitable for a diminishing range of salt-tolerant livestock up to about 9,750 EC; suitable for coarse industrial processes up to about 32,500 EC.
 * Pasture**: An area covered with grass or other plants used or suitable for the grazing of livestock. Grass or other plants for feeding livestock.
 * Confluence :** a flowing together of 2 or more streams, rivers or the like. Their place of junction.

The classification system used in the preparation of continental desertification maps is based on four classes of desertification: slight, moderate, severe, and very severe. The criteria for each class are as follows:
 * Desertification:**
 * Slight**: Little or no degradation of the soil and plant cover has occurred.
 * Moderate**: (1) 26 to 50 percent of plant community consists of climax species, or (2) 25 to 75 percent of original topsoil lost, or (3) soil salinity has reduced crop yields 10 to 50 percent.
 * Severe**: (1) 10 to 25 percent of plan community consists of climax species, or (2) erosion has removed all or practically all of the topsoil, or (3) salinity controllable by drainage and leaching has reduced crop yield by more than 50 percent.
 * Very Severe**: (1) Less than 10 percent of plant community consists of climax species, or (2) land has many sand dunes or deep gullies, or (3) salt crusts have developed on very slow permeable irrigated soils.