content: Assuming gravity is working as we know if (although of course if it really were working as we know it we'd never have an object as massive as the Earth spontaneous form the shape of a cube), almost all life would reside near the middle of each face, as that's where gravity would be "down". As you move nearer to the edges, it begins to feel like you're walking uphill as the acceleration of gravity approaches 45 degrees to the ground when you reach the edge. Each face of the cube would be in its own "season", with the climate depending heavily on the tilt of the cube relative to the sun. I'd imagine these climates would correspond closely with the climates we see in the different latitudes on our spherical Earth. The extreme edges and corners would be like mountain ranges, and I think they'd also pierce the atmosphere such that each face of the Earth would have its own "pocket" of air that never (or rarely ever) circulates to other faces. This is because the atmosphere is still fluid and so would "fall" to the lowest positions, which are in the middle of each face. I think sunsets and sunrises wouldn't be too different, just that an entire face would share a single time zone. This, along with the isolated atmosphere (and hydrosphere as well) might mean more extreme temperature variation as you won't have ocean and air currents mixing warm and cool (like what keeps the UK's climate so moderate).