1.   Some volcanoes produce only one kind of rock during their entire lives, but others show an impressive diversity.

2.   If a volcano produced serious damage in one place, it can do so again, he said.

3.   Io, the innermost large satellite of Jupiter, has wisps of sulphur dioxide gas produced by volcanoes.

4.   The fact that active volcanoes produce gold is not that surprising, Noble said.

5.   The tube also contained a hydrogen sulfidelike chemical to mimic the hydrogen sulfide produced by volcanoes.

6.   He added that scientists did not expect the volcano to produce lava flows.

7.   On Saturday, the volcano produced its largest ash eruption since coming to life in July after hundreds of years of dormancy.

8.   On Saturday, the volcano produced its largest ash eruption since coming to life last July after hundreds of years in dormancy.

9.   Although the new volcano is producing a lot of acid and discoloured water, Johnson said its effect on marine life is a bit unclear.