If you were to arrive in our solar system never having seen it before, you'd be impressed with variety. Giant gas planets with rings, moons spanning from minuscule to enormous, icy comets that hurtle in from the edges, rocky planets all with varying amounts of atmospheres. It almost seems like no two planets/moons formed the same way, but one really sticks out as an oddball.
It's Earth. Our planet has liquid water (weird!) It has life (even weirder!) It has plate tectonics churning away (continued weirdness!) It even has gigantic masses of rocks unlike anything else in the solar system (totally weird!) Those masses are the continents, made of rocks like granite, sandstone, gneiss, slate, andesite, rhyolite and more.
