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.
D) active systems emit their own energy while passive systems simply detect existing energy signals.
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Which of the following is accurate with regards to the balance of nature hypothesis?
a. It is currently viewed as the most accurate description of how ecological succession can arise at a climax community. b. It is the historically held equilibrium model of succession in which, once achieved, a climax community will be dominated by a few long-lived plant species. c. It suggests that there are always an appropriate number and diversity of producers to allow an ever-increasing number of primary consumers to inhabit a changing community. d. It suggests that the pathway of ecological succession is not predictable. e. It is an example of something that scientists were able to disprove conclusively.
What is a functional group?
A. a group of hydrocarbons that can be used to make new materials B. a set of atoms bonded together that give molecules containing them similar properties C. a set of molecules that are grouped together to form a functional material D. a group that adds function E. none of the above
Braided streams are not found in
A) areas where the load is higher than the capacity. B) bedrock-controlled channels. C) streams subject to new sediment from glaciers or landslides. D) locations subject to sediment deposition on the river bed.
Downwellings occur at surface convergences.
Answer the following statement true (T) or false (F)