What is the significance of stromatolites?
a) They are composed of benthic patches of bacteria found at hydrothermal vents.
b) Cyanobacteria produce carbonate structures in warm shallow seas that can date back to 3 billion years ago.
c) They are composed of siliceous deposits of diatoms and dinoflagellates.
d) They are composed of biogenous deposits of foraminiferans and coccolithophores.
B
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Which of the following terms refers to fog that most often forms as warm rain falls into a cold layer of surface air?
A. radiation fog B. evaporation fog C. upslope fog D. advection fog
Harry Hess and Robert Dietz proposed that the oceanic crust in the Atlantic Ocean was spreading apart at the Mid-Atlantic Ridge and that this process moved the continents apart from one another. They called this process
A. seafloor spreading. B. Gondwana. C. plate tectonics. D. continental drift.
On a world-wide basis, which of the following factors exerts the greatest influence over natural vegetation?
a. climate b. soil c. topography d. humans
What type would not be used as starting information when developing a hazard map?
A) slope map B) topographic elevations map C) geologic map D) aerial photographs