What substances are emitted from fumaroles?
A) Lava
B) Ash
C) Water
D) Volcanic gases
Answer: D
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On a summer evening at middle latitudes, twilight adds about how much time to the length of daylight?
A. 2 minutes B. 5 minutes C. 30 minutes D. 2 hours
A natural process which threatens life and property is known as a natural _______________.?
Fill in the blank with correct word.
Compared to the lithosphere, the asthenosphere is ____
a. ?cooler and more rigid b. ?cooler and more plastic c. ?hotter and more rigid d. ?the same temperature and rigidity e. ?hotter and more plastic
The endangered orangutan is mainly threatened because ____.
A. its food source is being eliminated B. it is hunted for bushmeat C. its habitat in Borneo is disappearing D. it is subject to poaching E. it is sensitive to pollution