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.
1 Discuss the different erosional features formed by alpine glaciers. 2  Describe the processes by which glaciers change the underlying rocks. 3  Discuss the particles deposited by glaciers as they advance and recede. 4  Describe the landforms created by glacial deposits.lacial Erosion. Glaciers erode the underlying rock by abrasion and plucking. Glacial meltwater seeps into cracks of the underlying rock, the water freezes and pushes pieces of rock outward. The rock is then plucked out and carried away by the flowing ice of the moving glacier (Figure below).