Consider the following sources of world water supply and arrange them in descending order.1.Oceans2.Rivers3.Polar ice and Glaciers4.Ground waterSelect the correct answer from the code given below:

1. A

   1, 3, 4, 2

   1, 3, 4, 2. Oceans → ice/glaciers → groundwater → rivers.

2. B

   1, 2, 4, 3

   1, 2, 4, 3. Puts rivers second; they are the smallest store.

3. C

   1, 2, 3, 4

   1, 2, 3, 4. Same river-second error.

4. D

   1, 4, 3, 2

   1, 4, 3, 2. Puts groundwater before ice.

Summary. Official key is (a) 1, 3, 4, 2. Ocean, ice, groundwater, river. Also note: Oceans ~97% — Salt water; Ice ~2% — Largest freshwater store; Groundwater — Next freshwater store; Rivers — Tiny share of global water.