Natural Phenomena:  Discovery Education video        Answer the following questions as you watch the video.

  1.  What is a lake and what are two features that the lake has?  Inlet and outlet
  2. The Salt Lake in Utah does not have the 2 features, why?  What does it leave behind after evaporation?

                Does not have an inlet or an outlet>  Leaves behind salt

  1. What does runoff contain?  Water from rains and snows and carries dissolved salts
  2. Why does the Great Salt Lake get saltier and saltier?  No outlet and the water evaporates
  3. Why is it possible for humans to float in the Great Salt Lake?  No outlet the salt content increases
  4. What is lakes responsibility?  Temporary storage places for freshwater on the way to the oceans
  5. How are lakes created? Low areas of land scooped out by glaciers or carved by glaciers and filled by the melting glaciers.  Earthquakes open up areas that are filled by precipitation, Extinct volcanic tops filled by precipitation.
  6. How do lakes eventually disappear?   .Slowly filled in by sediments that are carried by the streams. As it fills, plants starts to form and turn in to marshes and then eventually into a meadow. (eutrophication)
  7. Rivers:  Where did the water come from originally?  Precipitation for fresh water
  8. Where did the water come from and how does it move? Small streams to books - small rivers - large rivers
  9. The rivers take the form of the land they travel through.  Give some examples  Waterfalls, broad and lazy, slowed by dams
  10. Not all rivers flow the same way why?:  Continental Divide:  Rocky Mountains:  West of the rocky mountains freshwater flows to Pacific Ocean.  East flows to the Mississippi River
  11. What is the Largest river in the United States?  Mississippi River
  12. Is there more fresh water underground than in lakes and rivers and why?. There is several more times freshwater because the water seeps into the ground
  13. What is an aquifer?  Underground area of soil/rock already saturated with water and stopped by impermeable rock.
  14. The top of the aquifer is called the water table
  15. How is a well dug and where does it go to?  Dig or drill a hole into the aquifer.  Humans use pumps to pull the water to the surface.
  16. What is a spring?  Water that has entered the aquifer in a higher area and then is forced out of the aquifer through a crack in the ground.  Area above the water table has been eroded away.
  17. How much water is used in the US per person in one day:  1000 gallons per day
  18. Why is it important for us to know where our water comes from?  If we know where the freshwater comes from then we can make better decisions about how to get and use water