Two rivers in Eastern Meghalaya have turned blue due to high acid content. Which two rivers are these?

a. Lukha

b. Myntdu

c. Brahmaputra

d. Both a and b

ANSWER: Both a and b

Explanation:

The Lukha river in East Jaintia Hills district and certain sections of the the Myntdu river in West Jaintia Hills district have changed their colour to a bright sky blue indicating a very high acid content, leading to the death of a vast section of aquatic life. The high acid content has also made the water unfit for human consumption. The colouration was first detected in 2007.