By earth and air, let him live up to the task.

This base has now become nearly covered by earth and stone.

"I swear it by earth and water," said the boy in green.

Mars has little water - by Earth standards, practically none at all.

By Earth reckoning the descent would have taken them about a day and a half.

This was the earliest type of beacon ever built - by Earth, no less.

Today some asteroids pass quite close by Earth and others cross its path.

Terrain variations formed by earth and stone, which can be natural.

It is estimated to pass by Earth in 2027.

Galileo's second swing by Earth, a year from now, will be even closer: about 180 miles.