Eruptive activity at the summit of the Nevada del Ruiz volcano in Colombia in 1985 caused snow and ice to melt, generating a ________ that killed 23,000 people in the village of Armero.
A. gas cloud
B. mud flow
C. hyaloclastic flow
D. lava flow
E. pyroclastic flow
Answer: B
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Rotation and orbit of the earth is responsible for the changes in the amount of solar energy reaching earth. True or false?
Indicate whether this statement is true or false.
Which of the following accurately describes the state of the continents and ocean 65 million years ago?
A. All the continents were roughly in the relative positions they hold today but were much closer together with smaller oceans in-between them. B. Seafloor spreading had opened and connected the North and South Atlantic Ocean but North America and Eurasia were still partially connected. C. The Iapetus Ocean was in the final stages of closing before the initial formation of Pangaea. D. All the major continents adjoined in a landmass called Pangaea and surrounded by the Tethys Sea.
This diagram shows a place underlain by uniform materials. What is the approximate average gradient (slope) of the water table in this location? The vertical exaggeration on this diagram is 10x.
A. less than 20 m/km B. 100 m/km C. 200 m/km D. 20 m/km
Which of the following is not likely to occur as the result of a 10km (6mi) diameter object striking the Earth?
A. worldwide sea level drop B. tsunamis C. acid rain D. extensive wildfires