The Grand Canyon was primarily formed through a combination of weathering and erosion, particularly by the Colorado River over millions of years. While ocean wave erosion and glacier/ice erosion can shape landscapes, they are not the main processes responsible for creating the Grand Canyon.
The Colorado River eroded the rock layers, creating the deep, steep-sided canyon we see today. Additionally, weathering processes, such as freeze-thaw cycles and chemical weathering, also contributed to the canyon's formation by breaking down rock and sediment. Thus, the correct answer is weathering and erosion.
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