EESA06H3 Lecture : Chapter 20
Document Summary
Canada: a young nat ion, but an old country. The north american continent was assembled by plate tectonics processes that brought together many smaller land messes. When fused and locked together, they have created the geological mosaic of the present-day continent. The process of continental building has not been a simple one and has taken more than 4 billion years to accomplish. Construction of north america began at least 4,000 million years ago with the formation of acasta gneiss of the north-west territories, which now forms part of the slave. The building of north american was essentially complete 65 million years ago, although the modern landscape is the result of geologically recent glaciations that have occurred in the last 2. 5 million years. The last ice sheet left the southern portions of the country only. 12,000 years ago, and finally melted in labrador 6,000 years ago.
