An Earth satellite is in an elliptical orbit. The satellite travels fastest when it is
A) nearest Earth.
B) farthest from Earth.
C) It travels at a constant speed everywhere in orbit.
A
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The difference between active and passive remote sensing systems is that
A) active systems involve the latest generation of satellites while passive systems use signals from older satellites. B) active systems include aerial photography while passive systems rely on satellite imagery. C) active systems can operate throughout cloud or fog cover while passive systems require clear sky conditions. D) active systems emit their own energy while passive systems simply detect existing energy signals.
What is the network hypothesis and how does it help explain the high level of unemployment found in many inner-city areas?
What will be an ideal response?
Provide a brief discussion of the theory of organic evolution. What evidence supports this
theory? What will be an ideal response?
In Mediterranean climates such as in parts of California, Australia, and South Africa, frequent wildfire is necessary for the health of natural plant communities because ________.
A. many of the plant species must have the smoke and/or heat of fire to germinate their seeds and it helps to control parasites and it influences insect behavior B. it helps to control parasites C. it influences insect behavior D. it controls seasonal variations of solar albinism E. many of the plant species must have the smoke and/or heat of fire to germinate their seeds