Erosion: The movement of weathered rocks and soil by wind, water or ice.

Absorbs: To take in; to soak up; "The sponge absorbs water."

Landform: A shape of the land, such as a mountain, plain, or plateau.

Observation: Something you have noticed by watching carefully.

Water Cycle: The constant movement of the Earth's water. Plants give off moisture, and water from rivers and oceans evaporates, making water vapor. This vapor rises, forms clouds, and then falls as rain, hail, or snow.