Summarize the hydrologic cycle, and how important this cycle is to earth.
http://en.wikipedia.org/wiki/Water_cycle
The hydrologic cycle, also known as the water cycle, is the continuous movement of water on, above, and below the Earth's surface. It involves the processes of evaporation, condensation, precipitation, and runoff.
Here's how the hydrologic cycle works:
1. Evaporation: The sun's heat causes water from oceans, lakes, rivers, and other water bodies to evaporate and rise into the atmosphere in the form of vapor.
2. Condensation: As the water vapor rises and cools in the atmosphere, it condenses into tiny water droplets that form clouds.
3. Precipitation: When the water droplets in the clouds combine and grow too heavy, they fall to the Earth's surface as precipitation, which can be in the form of rain, snow, sleet, or hail.
4. Runoff: Precipitation either infiltrates into the ground to become groundwater or runs off into streams, rivers, and eventually into oceans, replenishing the water bodies.
The hydrologic cycle is critical for the Earth's ecosystems and essential for sustaining life on our planet. Here's why:
1. Water supply: The hydrologic cycle ensures a continuous supply of fresh water on Earth, which is crucial for drinking, irrigation, and industrial purposes.
2. Climate regulation: Water vapor in the atmosphere acts as a greenhouse gas, regulating the Earth's temperature. The water cycle helps distribute heat and energy, thus influencing global climate patterns.
3. Transportation of nutrients: The hydrologic cycle transports nutrients, such as nitrogen and phosphorus, from land to water bodies. These nutrients are essential for nurturing aquatic ecosystems and supporting the growth of plants and animals.
4. Erosion and sedimentation: The movement of water in the hydrologic cycle plays a significant role in erosion and sedimentation processes, shaping the Earth's landscape over time.
Overall, the hydrologic cycle is crucial for maintaining the Earth's water balance, supporting ecosystems, and contributing to various geological and climatic processes.