Two words, which have a certain relation, are paired. Select a correct option to substitute the question mark so as to make a similar relational pair with the word given after double colon (::)

Ocean : water :: Glacier : ?

Correct Answer: The correct option is Ice.

Step-by-Step Explanation:

1. Understand the given relationship:
In the first pair, Ocean : water, an ocean is a massive body composed primarily of water.

2. Apply the same logic to the second pair:
We need to find what constitutes a glacier in the same way water constitutes an ocean.
A glacier is a large, persisting body of dense ice that is constantly moving under its own weight.

3. Evaluate the options:
• Cooling: This is a physical process/sensation, not the primary substance that forms a glacier.
• Cave: A cave is a subterranean void or structure, not the material of a glacier.
• Ice: Ice is the primary substance that forms a glacier, exactly matching how water forms an ocean.
• Mountain: A mountain is a landform where glaciers may exist, but it is not the substance composing a glacier.

Therefore, the word that completes the relational pair is Ice.