“The peaks of the Rocky Mountains are higher and more jagged than the peaks of the Appalachian Mountains becausea) glaciers moved across the Rockies during the last ice ageb) the tectonic forces that created the Rockies were very strongc) volcanoes formed the peaks of the Appalachiansd) the Appalachians have been worn down by rain, ice, and wind over time”,”d) the Appalachians have been worn down by rain, ice

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Which of the following is an accurate statement about the ecosystems of the United States and Canada?a) a larger part of Canada is coniferous forestb) the northeastern regions of Canada are primarily temperate grasslandsc) part of the southeastern United States is a tropical rain forestd) part of both the United States and Canada is a desert scrub region

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