Here's why:
* Tectonic Plates: Earth's outer layer (the lithosphere) is broken into large pieces called tectonic plates. These plates move and interact with each other, causing earthquakes, volcanoes, and mountain building. No other terrestrial planet exhibits this kind of plate tectonics.
Let's look at the other options:
* Core: While Earth's core is unique in its size and composition, other terrestrial planets like Mars and Venus also have cores.
* Mantle: All terrestrial planets have a mantle, though the composition and behavior can vary.
* Crust: All terrestrial planets have a crust, though the thickness and composition differ.
Therefore, Earth's tectonic plates are the unique feature that distinguishes it from other terrestrial planets.