We are at about 22,000 feet above the surface of the earth.

Maybe they did not like getting too far from the surface of the earth.

They were 9,500 feet below the surface of the earth.

Here he had been able to keep close to the surface of the earth.

Although be never went to the surface of the Earth his business was there.

The surface of the Earth was a hundred miles or so away.

Land cover is the physical material at the surface of the earth.

But there is only so much land and water on the surface of the earth.

If you think about it, we are moving on the surface of the earth.

Before then, the entire earth surface was covered with water.