1. Why is accessible drinkable water such a small portion of Earth's total supply of fresh water?

a . fresh water is in the ocean
b . fresh water is in the clouds
c . fresh water is below the ground
d . fresh water is in the ice caps and glaciers *****

2. What does turbidity measure?
a . amount of dissolved oxygen in water
b . clarity or cloudiness in water *****
c . amount of nitrates or phosphates in water
d . temperature of water

3. How does overgrowth of algae actually cause algae to die?
a . water becomes to cloudy so not enough light for photosynthesis *****
b . to much oxygen in water
c . temperature increase in water
d . pH increase

4. Which of the following describes watershed?
a . valley between mountains or hills
b . place where tributaries meet up and form a larger lake
c . where water infiltrates and absorbed into the ground
d . an area of land were all water drains into the same body of water *****