Pahoehoe and Aa can form in the same lava as it flows away from the eruptive vent. How does each form? What role does temperature play?
What will be an ideal response?
Answer: Pahoehoe produces smooth, ropy texture as the molten material on the interior of the lava flow continues to advance, stretching the cooling (but pliable) exterior of the flow. Aa is a rough, jagged texture produced as exterior cooling continues, but the warm interior lava still tries to flow.
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What is one advantage of urbanization?
A. easier access to medical care and social services B. increased attention to wildlife habitats C. stricter regulation of pollution D. better water quality E. more stable climate control
The albedo of Earth's surface is only about 4%, yet the combined albedo of Earth and its atmosphere is about 30%. Which set of conditions below best explains why this is so?
A) high albedo of clouds; low albedo of water B) high albedo of clouds; high albedo of water C) low albedo of clouds; low albedo of water D) low albedo of clouds; high albedo of water
What disease is diagnosed by monitoring amylase activity?
A) hepatitis B) liver cancer C) pancreatic disease D) prostate cancer
Ocean surface currents
A) initiate Ekman transport. B) flow at a 90 degree angle away from the prevailing winds. C) are warmest in midlatitude waters. D) are not involved in La Niña events. E) are typically colder than the water 500 meters below.