Activity for Cadence‭

Type	On...	Excerpt	Status	Date
Answer	—	A: Why would one hemisphere of a planet be very mountainous while the other is flat? It turns out there's something very much like this, right next door to Earth. Observe the topography of Mars: (Image courtesy Wikipedia; larger version here.) The large blue areas in the northern hemisphere, making up about a third of the surface, are about 4 to 6 km lower in altitude than the ye... (more)	—	about 5 years ago