The sun is more likely to appear red at sunset than in the middle of the day as a result of the
A) scattering of lower frequencies by larger particles in the air.
B) longer path of air through which sunlight travels.
C) lower frequencies of light emitted late in the day by the sun.
D) pollutants emitted by humans in daylight hours.
E) absorption effects of the smaller particles in the air.
Ans: B) longer path of air through which sunlight travels.
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Which statement regarding mammals is false?
A. All mammals feed their young milk. B. All mammals have nipples. C. Some mammals lay eggs. D. Marsupial mammals are born at an earlier developmental stage than placental mammals.
The Kurds are in all of these countries except
A. Syria B. Saudi Arabia C. Turkey D. Iraq
During the Japanese Tsunami, the seafloor was thrust up 5 m to 8 m (16 feet to 26 feet).
Answer the following statement true (T) or false (F)
Convective cooling cools rocks much more rapidly than heat conduction. Hydrothermal circulation represents convective cooling at ocean ridges and is well known from things like black smokes, but only occurs close to the spreading ridge axis
When geophysicists measure the geothermal gradient in areas along ridges where there is no hydrothermal activity, the thermal gradient is far below what you would predict theoretically, but near hydrothermal vents it is far more than you would predict. Why would this be? A) Organisms growing around hydrothermal vents disturb the thermal properties, insulating the surface, to make an apparent high thermal gradient. B) Most of the heat is carried away by convection as hydrothermal systems, so the average geothermal gradient away from the hydrothermal circulation is depressed. C) The thermal gradient in water represented by the hydrothermal system must be different than the rock, so it is measurement artifact. D) The measurements are incorrect because it is too hot to measure thermal gradient in molten rock.