Other smaller craters, more than one billion years old, are believed to have disappeared with erosion.

Geologically speaking, any crater less than a million years old is an infant, born yesterday.

It goes to an old empty crater the ogres used.

"It is more than likely that the lake may be an old crater," said Summerlee.

Up ahead, less than a kilometer away, the track bed ended in an old crater formed by an explosion.

On the way he also tells of an old crater that is filled with garnets.

I know, but I was asked to find a useful old crater or two.

The rays cut across older craters, while a few younger crater have formed on top of them.

Often, at the summit of volcanoes, the old craters close and new ones open.

Then he said, "Must have been an old crater filled in with loose rubble."