Here's why:

* Windward: The windward side is the side of the mountain that faces the wind.

* Leeward: The leeward side is the side of the mountain that is sheltered from the wind. It's the "downwind" side.

Think of it like this:

Imagine you're standing on a mountain with the wind blowing directly at you. The side you're facing is the windward side. The side behind you, where the wind is not hitting, is the leeward side.

Important Note: The leeward side of a mountain is often drier and warmer than the windward side due to the rain shadow effect.