Which of these four numbered features on the surface or in a cave is a stalagmite? 
Definitions:
Westerly
Winds or weather systems that move from west to east, common in the mid-latitudes due to the rotation of the Earth and atmospheric conditions.
Prevailing Winds
Winds that blow predominantly from a single general direction over a particular point on Earth's surface.
Nitrogen
A colorless, odorless, tasteless gas that is the most abundant element in Earth's atmosphere, essential for plant and animal life.
Atmosphere
The layer of gases surrounding a planet, crucial for supporting life on Earth, composed mainly of nitrogen, oxygen, argon, and carbon dioxide.
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