They are believed to be caused by an impact into ice.

His father also died of cancer when he was a child, which caused him to further retreat into music.

Cross remained involved in activist causes well into her 70s.

Thousands of years ago, a landslide caused its division into two parts.

Life is cyclical, so what may cause consumer products to cycle back into the picture?

This caused our reentry into the earth's atmosphere to be very far off course.

These are believed to be caused by later intrusions into the early flows.

This all seems to have caused Selden's entry into politics.

For example, some orbits may cause the moon to spiral back into the planet.