21.   The green layers, the researchers found, resemble basaltlike rock known as komatiite, which forms from the molten lava, not ocean sediments.

22.   They must leap across rickety platforms, jump gorges and fly hovercrafts over molten lava, all while fighting a variety of pesky monsters.

23.   Think of them as huge water balloons, except that they splash molten lava around when they plop to earth.

24.   Popocatepetl does not generally produce flows of molten lava.

25.   Scientists were closely watching the dome for signs of expansion, which would indicate molten lava in the volcano could erupt.

26.   Scientists were closely watching the dome for signs of expansion, which would indicate molten lava in the volcano is about to blow.

27.   They said the rock had been formed from molten lava, similar to volcanic rocks on Earth.

28.   The volcano burst into activity on Thursday, sending rivers of molten lava heading for Goma.

29.   They warned that the population around the volcanoes could be driven into the flood of refugees to escape molten lava.

30.   It has attracted generations of vulcanologists to its molten lava lake, the level of which rises and falls according to seismic activity.