The shape of shield volcanoes is a function of
A) lava viscosity
B) proportion of pyroclastic debris included in the edifice
C) local variations in the tilt of the land surface
D) the explosive nature of the eruptions that produce the shield
A
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Indicate whether this statement is true or false.
A sand spit forms when ____
A) a long-shore current speeds up when approaching a headland B) a long-shore current slows as it clears a headland and approaches a quiet bay C) a turbidity current flows near a coast D) sediment deposition connects a barrier island to the mainland
Oceans have absorbed approximately one-third of the excess carbon dioxide that humans have added to Earth's atmosphere so far. This has slowed the progression of global climate change, but it has led to ________
A) an increase in the pH of the world's oceans B) growth of oyster populations worldwide C) increases in growth of coral reefs D) loss of oxygen from the oceans E) a decrease in the pH (ocean acidification)
Which statement about the formation of the magnetic field of Earth is true?
A) Its formation is a result of magnetic materials in the core. B) Its formation is a result of the movement of magnetic materials in the core. C) It constantly forms, is lost, and is regenerated. D) It is more strongly observable at relatively low temperatures.