The most important measure of the size of a river is the
a. number of its tributaries.
b. width of its mouth.
c. volume of its discharge.
d. size of its watershed.

Brian's school locker has a three-digit combination lock that can be set using the numbers 5 to 9 (including 5 and 9), without repeating a number. the probability that the locker code begins with a prime number is %. the probability that the last digit of the locker code is an odd number is %.

Many rivers in central asia come from

Why slip off slopes are found on the inside of meanders? why river cliffs are found on the outside of meanders?