A) Erosion by glaciers during the Pleistocene epoch. B) Volcanic activity during the Mesozoic era. C) The collision of continental plates about 150 million years ago. D) Tectonic uplift in the Cenozoic era.
A) The Illinoian Glaciation. B) The Wisconsinan Glaciation. C) The Pinedale Glaciation. D) The Vashon Glaciation, which lasted from about 19,000 – 16,000 BP.
A) Great Salt Lake. B) Lake Michigan. C) The Salish Sea. D) Lake Erie.
A) Appalachian Mountains and Cascade Range. B) Cordillera Blanca and Andes. C) Pacific Ranges and Vancouver Island Ranges. D) Rocky Mountains and Sierra Nevada.
A) Sand dunes and desert basins. B) Glacially striated tablelands and rolling hills underlain by sedimentary rocks. C) Karst topography with limestone caves. D) Volcanic mountains and lava plateaus.
A) Alluvial soils and loess. B) Lateritic soils and peat bogs. C) Soils formed from glacial till, glacial outwash, and Lacustrine deposits. D) Chernozem and podzol.
A) Ozark Plateau and Black Hills. B) Great Plains and Mississippi Alluvial Plain. C) Pocono Plateau and Allegheny Plateau. D) Fraser Lowland, Nanaimo and Nahwitti lowlands of Vancouver Island.
A) Columbia Basin. B) Great Basin. C) The Puget Sound basin. D) Colorado Plateau.
A) Salish Sea. B) Bering Sea. C) Gulf of Mexico. D) Hudson Bay.
A) Natural wildfires and droughts. B) Earthquakes and volcanic eruptions. C) Industrialization, agriculture, forestry, urbanization, and suburban sprawl. D) Asteroid impacts.
A) Extreme elevation. B) Variable elevation. C) Low elevation. D) High elevation. |