Which volcanic hazard was responsible for most of the deaths from the 1883 eruption of Krakatoa
volcano, Indonesia?
a. lava flows
b. lahars
c. pyroclastic density currents
d. tsunamis
e. volcanic landslide
D
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The type of metamorphism that typically produces the hard, dense, fine-grained rocks called mylonites
is called ____________________. Fill in the blank(s) with the appropriate word(s).
The development of new varieties of grain crops increased productivity by increasing the
A) surface area of the leaves of the plants. B) size of the roots and ability to absorb water. C) strength of the stems to support more grains. D) size and number of seeds.
Some scientists think that Yellowstone could cause a future disaster because
A. land near Yellowstone is uplifting in some places and subsiding in others. B. past eruptions from Yellowstone carried ash over a huge area of western North America. C. scientists think that magma is still present at depth. D. the area is part of a caldera. E. All of these choices are correct.
Deposits of which of the following minerals would never be considered an ore?
A) quartz B) galena C) chalcophyrite D) hematite