| monitor volcano | 0.86 | Scientists use satellites to monitor Mexican volcano. | ||
| say volcano | 0.33 | Some scientists say volcanoes and frequent earthquakes make it a dangerous place for storage. | ||
| study volcano | 0.33 | A lecturer at a further education college has won a grant worth more than a third of a million pounds to study volcanos. | ||
| watch volcano | 0.33 | They watch the volcano with wariness and fear the month of April, when rains begin. | ||
| descend volcano | 0.26 | Rescue workers helped the rest of the group descend the volcano. |