A series of ridges along a divergent boundary marks a(n) _______________ zone.?
Fill in the blank with correct word.
ANSWER: rift
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The transitional depositional environment that involves progradation is a(n)_____________________. Fill in the blank(s) with the appropriate word(s)
Which is not a factor that leads geologists to expect that convection in the mantle is likely?
A) Viscosity in the lithosphere is high. B) Viscosity beneath the lithosphere is lower because the rock is close to its melting temperature. C) Some of the lithosphere is denser than the asthenosphere. D) The thickness and mass of the mantle are huge.
The currents of the major oceanic gyre systems are driven by:
A) volcanic activity on the ocean floor. B) jet streams and Rossby Waves in the upper atmosphere. C) tropical Storm activity. D) drag of surface winds that are part of the major anticyclonic pressure and wind systems over the ocean basins.
Humans intervene in the nitrogen cycle in several ways. Which of the following is one of these?
A. Burning fossil fuels adds nitric oxide. B. Agriculture decreases the production of nitrous oxides. C. Protecting and replanting forests releases nitrogen. D. Harvesting nitrogen-rich crops stores nitrogen in the topsoil. E. Agriculture with fertilizers uses nitrogen in the aquatic systems.