Here's why:
* Surface Area is a Geometric Property: The surface area of the Earth is calculated based on its shape and size. It's like the area of a sphere, which is determined by its radius.
* Changes on Earth's Surface are Local: While we see changes on the Earth's surface like mountain formation, erosion, or deforestation, these are localized events. They don't significantly alter the Earth's overall size or shape.
* Geological Processes: Even large-scale geological processes like plate tectonics, while they can reshape the Earth's surface, don't change its total surface area. They might move continents around or create mountains, but they don't add or subtract land.
Important Note: While the Earth's surface area itself is fixed, changes on the surface can affect *how we perceive* that area. For example, deforestation can reduce the amount of forested land, but it doesn't actually reduce the Earth's total surface area.
Let me know if you'd like to explore any other Earth-related concepts!
