. This theory about the formation of volcano was later ______ by many observations.

The "one-eyed giant" in the Odyssey________. A: might be a volcano in fact B: lives in the volcano of Mount Etna C: lies ill the sea off the coast of Sicily D: is a real person in history

There are lots of beautiful trees in the _____. A: sea B: forest C: volcano

中国大学MOOC: The volcano ______ last week and destroyed the whole village.

The fury of the crowd erupted like a _______. A: volume B: volcano C: timber D: lunar

volcano is to lava as () A: geyser is to water B: fault is to tremor C: glacier is to fissure D: avalanche is to snow E: cavern is to limestone

The clouds, which are formed after the eruption of the volcano, have____the sun and now it is as dark as night. A: blocked out B: blocked in C: blocked off D: blocked up

Which of the following is true about the Arctic National Wildlife Refuge? A: It is a huge wildlife park. B: It is the largest protected wildness region in the US. C: It located within the arctic circle, in the region of Russia. D: It is the largest volcano park in the arctic circle.

Which of the following is true according to the video? A: Scientists haven't reach consensus on the origin of water. B: Volcano eruption brought about the water in the original form on the earth. C: The formation of atmosphere helps to entrap the water coming from the collosion of asteroids.

The most important crucial question is what causes water pollution A: Natural disasters such as volcano eruptions B: Animal waste C: Residues from storms and floods D: Every day sewage E: Garbage F: Oil spills G: Fossil fuels combistion H: Chemical fertilizers I: Pesticides