The question worth asking on any open plain is what is stopping the trees, because something is. Here are seventeen answers.
1. The Rainfall Squeeze
The basic temperate grassland occupies…
The useful thing to look at in any harbour is the wall - which direction it faces, how high it stands and where the entrance is - because that tells…
Every pass is a compromise between height and distance: the lowest crossing point is rarely the shortest route, and the route that everyone took is whichever combination was survivable. Here…
The useful habit when standing in an unfamiliar square is to look at what faces onto it, because the buildings around the edge record who wanted the space and what…
The question worth asking at the entrance to any tunnel is what problem made digging cheaper than going around. Here are seventeen, and the answers.
1. Pedestrian River Tunnels
Source:…
The feature that makes a fjord a fjord is the sill at its entrance - a shallow threshold of rock and debris left where the glacier terminated. Water inside is…