1. Weathering:
* Frost wedging: Water seeps into cracks in rocks, freezes, and expands. This repeated freezing and thawing puts pressure on the rock, causing it to break apart into smaller pieces.
* Chemical weathering: Rainwater can be slightly acidic due to dissolved carbon dioxide. This acidity can dissolve certain minerals in rocks, weakening them and leading to their breakdown.
2. Erosion:
* Rain: Rainwater can pick up and carry loose rock and sediment downhill, especially on steep slopes.
* Rivers and streams: As rainwater flows into rivers and streams, it gains momentum and can erode the riverbeds and banks, carrying away sediment.
* Glaciers: Glaciers are massive sheets of ice that slowly move downhill. They carve out valleys, grind down rocks, and carry massive amounts of sediment.
3. Transportation:
* Rivers and streams: As rivers and streams flow towards the ocean, they carry sediment downstream.
* Wind: Wind can pick up fine sediment (like sand) and transport it long distances.
* Ocean currents: Once sediment reaches the coast, ocean currents can move it along the shore.
4. Deposition:
* Beaches: As rivers and streams reach the ocean, their energy decreases, causing them to deposit sediment, creating beaches.
* Sandbars: Ocean currents and waves can also deposit sediment in underwater formations called sandbars.
Overall Process:
1. Weathering breaks down rocks on mountaintops, creating loose sediment.
2. Erosion carries this sediment downhill by rain, rivers, glaciers, and wind.
3. Sediment is transported by rivers, wind, and ocean currents towards the coast.
4. Finally, sediment is deposited on beaches and other coastal features by ocean currents and waves.
Therefore, the water cycle plays a vital role in the continuous cycle of weathering, erosion, transportation, and deposition that shapes the landscape and moves sediment from mountains to beaches.
