6. What happened to the average amount of Dead Zone from 1990 to 2015? * 1 point
a.)It increased.
b.)It decreased.
c.)It stayed the same.
7. What happened to the average surface temperature of the water from
1990 to 2005 to 2015?
a.)It decreased then increased.
b.)increased then decreased.
c.)It only increased.
d.)It only decreased.
8. What is the best possible reason for different water clarity
measurements at each location?
a.)They all have the exact same amount of fish in them.
b.)They each have a different pH.
c.)They each have a different amount of pollution due to factories, farms, or other
human activities.
d.) the water clarity is the same for each location.