How thick is the crust of the earth?

Sometimes likened to the shell that covers an egg, the layer of rock or crust that covers the surface of the earth is, on average, 22 miles thick.

How thick is the ice that covers Antarctica? The continent Antarctica is almost completely covered with an ice…
How much of the earth's surface is permanently frozen? About 20 percent of the earth is under permafrost. This…
How much of the earth is unexplored? What is left of the earth that is unexplored is…
What's the smallest country on earth? The smallest country on earth is Vatican City, the seat…
How fast does the earth travel around the sun? The earth moves at 66,641 miles per hour around the…
If the moon passes between the earth and the sun every month, why doesn't it eclipse the sun? The orbit of the moon around the earth is tilted…