Canyon

geology · water · landforms · nature

Rivers cut canyons. Over millions of years, flowing rivers wear away layers of rock and soil, creating deeper and deeper valleys. The water carries away tiny pieces of rock as sediment, gradually hollowing out the landscape.

Soft and hard rock. Canyons form best where soft rock layers sit next to hard, tough rock. The soft rock erodes faster, while the hard rock resists wearing away, creating dramatic cliff walls on either side.

Elevation makes all the difference. Canyons happen when a river's starting point high in the mountains is much higher than where it flows out to the ocean or a lake. This big drop in elevation gives the river power to carve downward.

Weathering and erosion team up. Wind, water, and freeze-thaw cycles break rock into pieces (weathering), while the river carries those pieces away downstream (erosion). Together, these two forces slowly transform landscape into canyons.

Deep geological timescales. Canyon formation takes millions of years, not days or months. A river might cut just a tiny bit each year, but over vast stretches of time, those small changes add up to dramatic results.