Contrast pahoehoe and aa lava flows
What will be an ideal response?
Aa flows have surfaces of rough jagged blocks with dangerously sharp edges and spiny projections. Pahoehoe flows exhibit smooth surfaces that sometimes resemble the twisted braids of ropes.
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In 2010, the world's top gold producing countries were, in order
a. South Africa, United States, China, Australia and Russia b. China, Australia, South Africa, United States and Russia c. Russia, India, China, United States, Brazil d. India, Brazil, China, United States and Canada e. Brazil, United States, China, Canada and Australia
The Soviet Union established the _______________ to unite the countries of eastern Europe in the Soviet defense bloc.
Fill in the blank(s) with the appropriate word(s).
Which of the following best indicates a location where sediment is deposited but not eroded?
A. location 1 B. location 2 C. location 3 D. location 4
The Millennium Ecosystem Assessment primarily characterized human impact on
A) atmospheric carbon dioxide levels. B) degradation of the ozone layer. C) ecosystem services. D) plate tectonics.