The Sahara Desert is roughly the size of the United States.

The Great Wall of China is not visible from space with the naked eye — it's too narrow relative to its length.

The Panama Canal connects the Atlantic and Pacific Oceans.

The Earth's crust is composed of tectonic plates.

Petra in Jordan was carved into rose-colored rock cliffs.

The Great Rift Valley in Africa may eventually split the continent in two, forming a new ocean in millions of years.

There is more water in Earth's mantle than in all the oceans on the surface.

The Sahara Desert is roughly the size of the United States.

The Sahara Desert is roughly the same size as the United States.