prolonged rainfall means literally a large amount of rainfall over a long period of time in geographical terms.
A drought is an extended period without normal rainfall.
a long period of abnormally low rainfall is called a "drought."
1st period.
''Mercury (shortest),''Neptune (longest)
The germinal period is the shortest period of prenatal development, lasting approximately two weeks. This period begins at fertilization when the egg is fertilized by sperm and ends when the fertilized egg attaches to the uterine wall.
Monsoon
During the 4th month, the first month of the second trimester, the greatest amount of fetal growth occurs.
A meteorological map (weather map) is often used to show the current rate of rainfall, and other weather features. Or the map may be printed to show the rate of rainfall for a certain month, year, or for a longer period of time.
the shortest geologic time interval is a period.
The answer is Mercury.
A period.