A local film director is making a(n) ________________ about volcanoes.

中国大学MOOC: Hephaestus was the god of blacksmiths, fire and volcanoes.

Hephaestus was the god of blacksmiths, fire and volcanoes. A: 正确 B: 错误

A _________ (一瞥) at a map of the Pacific Ocean reveals that there are many islands far out at sea that are actually volcanoes.

In this mountain area, two volcanoes have been _____ lava (熔岩) for a week. It is very dangerous.

The features of volcanoes are much more complicated and their structure and behavior depend on the following factors EXCEPT ______.

The great size of the volcanoes and the ______ of their lava flows is considered an indication that the crust of Mars is fixed. A: explosion B: exploit C: extent D: exposure

In this mountain area, two volcanoes have been _____ lava (熔岩) for a week. It is very dangerous. A: evaluating B: examining C: ejecting D: equipping

There could be life on the Mars in the future if（） A: it supported life in the past B: certain gases are used to cool the planet C: the atmosphere can be heated enough to grow simple plants D: the planet’s volcanoes become as active as they were in the past

How did “columnar joints” come into being? A: The magma condensed into stone columns. B: The pumice stones piles layer by layer. C: The volcanoes look like columnar joints. D: Creatures were gradually fossilized and they slowly turned into a thick limestone layer on the seabed