Jupiter's moon Io is thought to be the volcanically active world in our solar system. What is the inferred source of heat?
A) It is a mystery; it should be very cold because it is the same size as the moon but far from the sun.
B) Very high abundances of radioactive elements have been detected on the planet.
C) Io is close to Jupiter, and the strong tidal forces on planet produce frictional heating of the planet.
D) Io has a strong magnetic field as does Jupiter, so as Io moves through Jupiter's magnetic field, large electrical currents are generated, which heat the planet.
C
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Which of the following terms refers to a relatively narrow downburst, one that is less than 4 km wide?
A. funnel cloud B. rain shaft C. narrow burst D. microburst
Using natural resources so as to be sustainable indefinitely requires
A. recycling household waste B. only using manufactured materials instead of natural resources. C. harvesting natural products at rates not faster than the materials can be naturally replaced.
The development of larger and darker varieties of house sparrows among northern populations of
the species is an example of a. microevolution. b. macroevolution
All of the following are likely effects of deforestation except
A. increased rate of soil erosion. B. increased rate of destruction of plant and animal habitats. C. increased runoff into rivers and streams. D. increased rate at which carbon dioxide is extracted out of the atmosphere.