11. Too much rainfall can cause:
a. drought
b. floods
c. water-borne diseases
d. destruction of houses
b, c, and d are correct.
Explanation:
a. Drought occurs when there is little to no rainfall in the area over a long period of time.
b. Excessive rainfall causes the rivers to flow beyond their banks and causes water to enter houses, cropping fields, etc. This phenomenon is called a flood.
c. Cholera, diarrhoea, typhoid, etc are some examples of water-borne diseases. These diseases spread very rapidly through the use of contaminated water. During heavy rainfall, pollutants and microbes can easily enter drinking water and contaminate it.
d. Waterlogging around houses causes the foundations to rot and weaken the structural integrity leading to the destruction of houses.
Hence, option (C) is the correct answer. Too much rainfall can cause floods, water-borne diseases, and the destruction of houses.