Explanation:

Only statement 3rd is correct.

• Much of the damage caused during GLOF events are associated with large amounts of debris that accompany the floodwaters.

• Statement 1 is incorrect: A GLOF is a type of flood occurring when water dammed by a glacier or a moraine is released suddenly.

• Statement 2 is incorrect:  Increasing glacial melting because of climate change, alongside other environmental effects of climate change (i.e. permafrost melting) mean that regions with glaciers are likely to see increased flooding risks from GLOFs.

• A GLOF is a type of flood occurring when water dammed by a glacier or a moraine is released suddenly.

• When glaciers melt, the water in these glacial lakes accumulates behind loose naturally formed 'glacial/moraine dams' made of ice, sand, pebbles and ice residue.

• Unlike earthen dams, the weak structure of the moraine dam leads to the abrupt failure of moraine dam on top of the glacial lake, which holds large volume of water.

• glacial retreat due to climate change occurring in most parts of the Hindu Kush Himalayas has given rise to the formation of numerous new glacial lakes, which are the major cause of GLOFs.

• Different types of lakes may have different levels of hazard potential.

• For instance, moraine-dammed lakes located at the snout of a glacier have a high probability of breaching with high hazard potential whereas erosion lakes have little chance of breaching.

Hence option 1st is correct.