How many gallons of water are needed to print a day’s supply of newsprint for the united states?
a.
1,000 gallons
b.
15,000,000 gallons
c.
350 gallons
d.
300,000,000 gallons

How does deforestation affect the water cycle? a. it increases the amount of runoff b.it increases the amount of percolation c. it increases the amount of transpiration d. it increases the amount of precipitationa it increases the amount of runoff

Where do the respiratory and circulatory systems meet? a. in the heart b. in the muscles c. in the lungs d. in the brain

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?