Consider the following statements :
1. The Ox-bow lakes develop from the cut-offs of meandering rivers in plains
2. Chilika and Kolleru lakes are lagoons formed by the Spits and Bars in coastal region
Which of the above statements is/are correct?

Arrange the following hills according to their location from north to south:

$1$. Nallamala hills

$2$. Shevaroy hills

$3$. Palkonda hills

$4$. Javadi hills

The property which helps an insect to move on the surface of the water is ______:

Which among the following rivers flows through Tibet and is known as the Yarlung Tsangpo?