Why would sand be deposited behind a small island to form a spit or tombolo?
A) The tidal affects are trivial behind the island, so the sand is not swept away.
B) Waves refract around the island and the wave energy is dissipated on the island, allowing quiescent water behind, and sand drift to accumulate behind the island.
C) The onshore current from one direction piles up sand here.
D) The island protects the coast from rip currents, preserving the sand.
B
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How does a crevasse form?
A) A glacier moves over a volcanic hot spot, causing differential melting and caving it inward. B) A glacier moves across a ridge of particularly resistant rock, which breaks the glacier from the bottom upward. C) Internal stress causes a glacier's upper surface to break as the glacier moves. D) A glacier moves over a pre-existing stream valley, which causes it to fracture on each side of the valley.
Discuss the role that accretion of terranes played in the development of North America. What will be an ideal response?
What is the most visible manifestation of eutrophication?
a. Hypoxia b. Decomposition c. Nitrogen fixation d. Plankton bloom
What does the Big Bang Theory explain?
A. The origin of the Milky Way Galaxy B. The origin of the universe C. The source of red color on Mars D. The origin of the Moon