Related to any physical feature of the earth's natural environment.
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An open, step-like fold in rock over a large area.
A gently sloping surface, usually covered with gravel, the result of erosion.
The theory that the earth's surface is divided into a few large, thick plates that are continually moving.
硬、 泥裂粘土非常平坦、 干燥的湖床。
接收每年降水量的 10 和 20 英寸之间。
An arched fold in the shape of a U.
A large, fan-shaped pile of sediment forming at the base of narrow canyons onto a flat plain at the foot of a mountain range.
