a) 10,000 square kilometers
b) 20,000 square kilometers
c) 30,000 square kilometers
d) 40,000 square kilometers
Answer: c) 30,000 square kilometers
a) 10,000 square kilometers
b) 20,000 square kilometers
c) 30,000 square kilometers
d) 40,000 square kilometers
Answer: c) 30,000 square kilometers