Environmental Science, Group 2 presentation \m/

1. Water Cycle And its different processes Maurice Rivera, Robert Ursua, Angelika Escobar, Hans Maala and Aliya Miranda II-Adelfa Group 2

2. What is a Water Cycle? Also known as hydrologic cycle, water cycle describes the continuous circulation and flow of water on, above and below the surface of earth.

3. What is a Water Cycle?

4. Importance of Water Cycle The water cycle is generated from solar energy. 86% of the global evaporation are from oceans. Oceans reduce their temperature by evaporative cooling. Without the cooling, we might have a warmer planet.

5. Different Processes There are different processes to make water continue its cycle. In order, These are: Precipitation Runoff Infiltration Subsurface Flow Evaporation Condensation Transpiration

6. Water Cycle Processes Precipitation Precipitation happens when water vapor is pulled down by gravity and deposited on the Earth’s Land. Main forms of precipitation are rain, snow, ice pellets and snow pellets (soft hail).

7. Water Cycle Processes Runoff and Infiltration Runoff is the water flow that occurs where water moves across the land then seeps into other bodies of water or drained in a watershed. Runoff can be generated by rainfall or melting of snow/ice. The watershed acts as a tunnel by collecting all the water within the area below the watershed then channeling it into a body of water. Infiltration is the process were the water enters the soil. Infiltration happens because of gravity and capillary action.

8. Water Cycle Processes

9. Water Cycle Processes Subsurface Flow Process were the infiltrated water are channeled and seeped to different bodies of water like oceans, springs, rivers or being pumped out of the land surface.

10. Water Cycle Processes Evaporation Evaporation is a phase transition or the change of state of water or any forms of liquid to water/liquid vapor (liquid to gas). It occurs when heat is sufficient (for example, one major factor for evaporation to happen is the sun). Another example of vaporization is boiling.

11. Water Cycle Processes Condensation Another type of phase transition, only that it’s now water vapor changes into liquid droplets. It happens when a water vapor cools or compresses. Condensation also creates clouds and fogs.

12. Water Cycle Processes Transpiration A process parallel or similar to evaporation. It is the loss of water vapor from plants and trees, particularly perspiration of plants. Transpiration cools and regulates the plant’s temperature. Transpiration is a major factor in the environment.

13. Big Question: Is there such thing as water loss? There is no water loss without losing Hydrogen first. Although the balance of water on Earth remains constant, the water molecules do not. Over time, Earth loses gases like Hydrogen which can accelerate Hydrogen loss, and by association is water loss, from Earth’s atmosphere. If Earth will have a hot lower atmosphere, it could result in a humid upper atmosphere that accelerates the loss of hydrogen.

14. Human Activites that alters Water Cycle agriculture industry Changes of chemical composition in the atmosphere building of dams Deforestation or logging urbanization Water abstractions