Others cause spoilage. And, a small number are pathogenic (or harmful) and so can cause disease, such as foodborne illness. Three types of microorganisms can contaminate food and cause foodborne illness â bacteria, viruses, and parasites. Another group of microorganisms that one also needs to be concerned about are fungi, which are yeast and molds. Yeast and mold cause food to spoil but do not cause foodborne illness.
Lateral moraines above Lake Louise, Alberta, Canada. Lateral moraines are parallel ridges of debris deposited along the sides of a glacier. The unconsolidated debris can be deposited on top of the glacier by frost shattering of the valley walls and/or from tributary streams flowing into the valley. The till is carried along the glacial margin until the glacier melts. Because lateral moraines are deposited on top of the glacier, they do not experience the postglacial erosion of the valley floor and therefore, as the glacier melts, lateral moraines are usually preserved as high ridges.
Glaciers And Glaciation By definition a glacier is a mass of ice composed of compacted and recrystallized snow that flows under its own weight. This makes glaciers very effective agents of erosion, transportation and deposition of sediment. The two types of glaciers are Valley or Alpine glaciers Continental glaciers.The difference between them is where they flow. Valley glaciers flow in mountain valleys from high to low elevations. Continental glaciers or ice sheets flow over vast unconfined land areas.Valley glaciers are present at high altitude in mountain valleys of Alaska, the Italian Alps and New Zealand.lacial Drift. All sediment deposited by a glacier whether its a valley glacier or continental ice sheet, is called glacial drift. Till: unstratified sediment deposited directly by glacial ice. It is poorly sorted & contains large boulder, pebbles clay-sized particles.