Warmup with your table: What is Transpiration? A water molecule is currently in a lake, where could it possibly go (in one step)
Reminders Field Trip on September 19. MUST be passing. Permission slips go out next week. Deadline for Dominican Republic is Friday! If you or your parents haven't met with me be sure they do so!
Transpiration: The process of transferring water from the roots up to the leaves of the plant to facilitate nutrient transfer. The water is evaporated at the leaves.
Water Phases To view this animation, click “View” and then “Slide Show” on the top navigation bar.
Baby water cycle concept
The elementary water cycle:
Better…
EVEN BETTER, but still lacks time and amount information EVEN BETTER, but still lacks time and amount information!, like 90% of clouds are from ocean evaporation!
What happens to rain fall? Of 100 drops of rain 2 Goes into “ground water” 2 make it into our faucets 67 drops go back into the sky Within a week 30 of them go into creeks and rivers
But… how do those 67 drops make it back? IN TEXAS..
But… how do those 67 drops make it back? IN TEXAS.. 2 Goes into “ground water” 2 make it into our faucets 33 drops evaporate directly 34 drops make it via TRANSPRIATION 30 of them go into creeks and rivers
Atmosphere Source: US Geological Survey www.usgs.gov
Pause the hydrological cycle… lets talk AMOUNT in each place.
Million dollar question. Are these % of where water is static? Could they change? If you listen to news, you would know that most scientists that study it know the ocean level has risen 1-2ft in the past 50 years, and will rise several more feet in the next 50 years. What does this do to our percentages? In the “Ice age” … how might these amounts be different?
Pair Share – I’ll call names for answers in 2 minutes. Where is most of the water on earth? About what % of all water is there? Of just fresh water, where is most fresh water? Where is there more water, in the atmosphere or in all the rivers? Where is there more water, in the ground or in all the lakes of the world?
Lets talk TIME for a second How long does it STAY in each place. This is called “residence time” Some places you can guess have LONG residence times Oceans, lakes, glaciers, groundwater Some places you can then guess have SHORT residence times Clouds, rivers, soils, animals and plants.
Lets talk SPECIFIC times Reservoir Average residence time of a water molecule Antarctica 20,000 years Oceans 3,200 years Glaciers 20 to 100 years Snow 2 to 6 months Soil moisture 1 months Groundwater 100 – 10,000 years Lakes 10 to 100 years Rivers 1 to 6 months Atmosphere 9 days A single cloud 40 minutes
Lets talk Water USES City use Drinking water Sanitation Lawn water Car washing Farm use Um.. duh Industry use making energy. Cooling plants Used in the manufacturing process
A more fine tuned look
Where do we get the water we use? Three main sources: Rivers Ground water Lakes (main made reservoirs) Sources rarely used: Rain catchers/harvesters (mainly at homes) Oceans – it has to be desalinated (taking salt out is expensive) Sources never used for human needs: Glaciers, soil water, plant and animals
Assignment tomorrow Story of a water molecule. 1-2 pages, tell the story of 1 water molecule’s unique experience A group that gets separated and comes back together. Will need to include at least 15 changes, and convince me you have an in depth understanding of the complexity of the water cycle Changes, places, timing, etc.