5,200 metric tons over the whole planet is about 10 micrograms per square meter on average (assuming the distribution is even). Looking for a way to compare th

5,200 metric tons over the whole planet is about 10 micrograms per square meter on average (assuming the distribution is even). Looking for a way to compare this number to something I could relate to, I found that "an average grain of sand weighs approximately 50 micrograms". Of course this is not an evenly distributed ultra-fine powder with one grain of meteorite every 5 square meters, but it gives some idea of the surface you'd need to cover to find a decent-sized chunk. The article mentions Antartica as a good place to find meteorites, and there is a great scene in Werner Herzog's recent movie Fireball (about meteorites) where a team walking on an ice sheet in Antartica finds a large rock just resting on the ice with absolutely nothing else around for miles and miles. They are easy to spot on the ice and can remain undisturbed for a long time, so this is a good way to find sizable meteorites.