How do we KNOW that CONTINENTS MOVE? 🌎

Mars then vs now… What changed in 50 years? 🔴 A new image from our Mars Express shows a striking scene of two halves: Mars’s bright tan sands meeting dark deposits of volcanic ash. When this region was first seen by @nasa’s Viking orbiters in 1976, the ash was far less widespread. So what happened in less than 50 years? Either Martian winds have spread the ash over time, or they’ve stripped away the lighter dust that once covered it. What can we see in this image? At the top, a 15 km-wide crate