Which does not have an effect on water's density?
a. Temperature
b. Pressure
c. Viscosity
d. Salinity
ANS: C
Density can be affected by temperature, salinity, and pressure. For example, water's density increases
as temperature decreases. This is a normal occurrence, but water takes on a unique behavior. At
approximately 4? Celsius, water's density begins to decrease again. Slight changes in the density of
water can lead to layering of water masses in the ocean. Information can be found in the section Water
Has Unusual Thermal Characteristics
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Which of the following best describes the fumaroles that exist in Yellowstone National Park?
A) Hot springs so hot that they create steam and vent sulfuric acid B) Lava deposits that are constantly heated from superheated gases in the ground below. C) Smoke from lava pits below ground that vent to the surface through cracks. D) Lakes that are heated by underground pyroclastic flows.
Which of the following is the hair-like part of a nerve cell?
A) the axon B) a dendrite C) the synapse D) the vesicle
What is the greatest source of oxygen in deep water?
A) The respiration from bacteria B) The lack of large quantities of organisms C) Chemosynthesis D) Polar waters that have sunk from the surface
What economic changes could occur if Israel and the Palestinians were to reach a lasting peace? What kinds of general connections might be found between political conflict and economic conditions throughout the region?
What will be an ideal response?