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.
Piedmont glaciers are large, gently sloping ice mounds. Also known as lakes of ice, piedmont glaciers form when a valley glacier reaches the lowlands or plain at the foot of a mountain and spreads out. These are common in Alaska, Greenland, Iceland, and Antarctica.Glaciers that form in small valleys on the sides of mountains are called ice caps.Found in Norway, Iceland, Greenland, and Antarctica, ice caps usually do not move out of their basinlike area.ypes of glaciers. Glaciers that flow down a valley from high mountainous regions usually follow paths originally formed by rivers of snowmelt in the spring and summer. These valley or mountain glaciers end in a valley or ocean, and tend to increase the sharpness and steepness of the surrounding mountains along the way.