Even a rise in global temperature of several degrees Celsius might be enough to raise sea level by ____ or more.
a. a centimeter
b. ten centimeters
c. a meter
d. ten meters
e. twenty meters
Question 2
Thick sheets of ice advanced over North America as far south as New York as recently as ____.
a. 1816 (the year without a summer)
b. 1550
c. 18,000 to 22,000 years ago
d. 1,000 to 2,000 years ago
e. 2 million years ago