What era was each of these physical landform regions formed?
1. Innuitian Mountains
2. Arctic and Hudson Bay Lowlands
3. Western Cordillera
4. Interior Plains
5. Canadian Shield
6. Great Lakes-St. Lawrence Lowland
7. Appalachians
thanks so much.^^
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To determine the era in which each physical landform region was formed, we can look at geological evidence such as rock formations and fossils. While I don't have direct access to specific geologic data, I can provide you with a general understanding of the eras associated with each landform. Here are the potential eras for each region:
1. Innuitian Mountains: The Innuitian Mountains are located in the Canadian Arctic Archipelago. They were formed during the Paleozoic era, specifically during the Devonian to Carboniferous period.
2. Arctic and Hudson Bay Lowlands: The Arctic and Hudson Bay Lowlands are relatively flat regions located in northern Canada. The formation of these lowlands is closely tied to the Pleistocene epoch, which is part of the Cenozoic era. This era began around 2.6 million years ago.
3. Western Cordillera: The Western Cordillera is a mountainous region that stretches from northern British Columbia to the southernmost tip of Mexico. The Cordillera formation began during the Mesozoic era. The specific intervals of mountain-building activity within this era include the Jurassic and Cretaceous periods.
4. Interior Plains: The Interior Plains are characterized by flat to gently rolling terrain and are located in the central parts of Canada and the United States. The formation of these plains largely occurred during the Cretaceous period, which was part of the Mesozoic era. However, the ongoing deposition of sediment continued into the Cenozoic era.
5. Canadian Shield: The Canadian Shield is a large area of exposed Precambrian rock that covers a substantial portion of eastern and central Canada. It was formed during the Precambrian era, which is the earliest era in Earth's history, dating back approximately 4.6 billion to 541 million years ago.
6. Great Lakes-St. Lawrence Lowland: The Great Lakes-St. Lawrence Lowland is located in the southeastern part of Canada, surrounding the Great Lakes and the St. Lawrence River. It is primarily a result of glacial activity, particularly during the most recent ice age in the Pleistocene epoch.
7. Appalachians: The Appalachian Mountains are located in the eastern part of North America, extending from Canada down to the southeastern United States. Their formation began during the Paleozoic era, specifically during the late Ordovician period and continuing through the Devonian, Carboniferous, and Permian periods.
It's important to note that the formation of these landforms is a complex process, influenced by various geological factors, including plate tectonics, erosion, and glaciation.