1.   But there is a gap in the middle, covering such activities as looking for groundwater, charting magnetic anomalies and scouting out future landing sites.

2.   Is my driveway built over some sort of magnetic anomaly that makes the oil shift?

3.   The earth has magnetic anomalies that can frustrate even the most skillful scientific solutions.

4.   They are also using detectors to look for magnetic anomalies, indicating large pieces of metal, he said.

5.   Within hours of his first arrival, Breiner detected evidence of a magnetic anomaly at the site.