The Cascade Range or Cascades is a major mountain range of western North America, extending from southern British Columbia through Washington and Oregon to Northern California. It includes both non-volcanic mountains, such as the North Cascades, and the notable volcanoes known as the High Cascades.
1/2 * 20 = 10
You can also think of it as the 20 being divided by two.
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The sediment will pack together with other sediment and eventually harden into rock.
