GEOG 2RC3 Lecture : 2 The Physical Environment.docx
15 Mar 2013
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Since the end of the last ice age (12000 ya), niagara falls has retreated about 8km up the niagara river. Since father louis hennepin saw the falls in 1678, retreat = 300m. Explanation for the retreat/recession geologic composition of niagara escarpment. Why is canada s physical geography so essential to an understanding of its regional geography? . Physiographic region: an area with distinct surface landform features (geomorphology) and underlying rock structure (geology) Geomorphology: the study of landforms and the process(es) of their genesis (from greek root words: geo earth; and morpho form) Challenges imagining/understanding the ability of these processes to alter the physical landscape (force and time) Geographical evolution of north america featured three major developments: formation of the shield, formation of mountains, epeiric seas. Appalachian uplands eastern north america; paleozoic era. These periods of orogenesis between 250 and 600 million years ago. Shallow, sub-tropical seas covering the interior of north america during ordovician and silurian periods.
