A Drop in the Bucket

1
A Drop in the Bucket

• Project WET

2
Step 1

• Observe the 1 liter of water in the beaker (How
  many ml are in a liter?)
• This represents all of the water on Earth.
• Where is most of the water on Earth located?

3
Step 2

• Pour 30 ml of the liter of water into your
  graduated cylinder.
• This represents Earths fresh water, which is
  about 3 of the total.
• The remaining 970 ml (97) of water represents
  salt water found in oceans. Set this water aside.

4
Step 3

• Pour 10 ml of fresh water from the graduated
  cylinder into a plastic cup.
• This 10 ml of water represents non-frozen fresh
  water. Only 2.5 ml of this is surface water the
  rest is underground.
• The 20 ml of water left in the graduated cylinder
  represents water that is frozen in ice caps and
  glaciers. Set this water aside.

5
Question

• What are some reasons why the 10 ml of
• fresh water left may be unfit or unusable
• for human consumption and use?

6
Last Step

• Use the eyedropper to take one drop of water from
  the remaining 10 ml and release one drop into
  your bucket.
• This represents clean, fresh water that is not
  polluted or otherwise unavailable for use.
• This precious drop, about .003 of the total of
  all water on Earth, must be managed properly.