Why is it a misconception to assume that because scientific theories can change, that they cannot be trusted? What will be an ideal response?
Scientific theories have been rigorously tested by repeated experiments. There is strong
evidence to support them. As test methods improve and new technology becomes available,
scientists can refine a theory. Change in science is generally a matter of refining existing
evidence.
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Which of the following sources of radiation provides most of our yearly exposure?
A. dental and medical X-rays B. televisions (cathode ray tubes) C. living near nuclear power plants D. smoke detectors E. background radiation
Jet streaks are thought to have little to do with the development of severe thunderstorms
a. true b. false
Briefly describe the formation of a natural levee. How is this feature related to back swamps and yazoo tributaries?
What will be an ideal response?
The Flemings and Walloons live in
A) Belgium. B) France. C) South Africa. D) Switzerland. E) Liechtenstein.