An explanation that is supported by many observations, has no major inconsistencies, and is accepted by most scientists is ________
a. a hypothesis
b. a law
c. a scientific method
d. a theory
d
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A large volcano sits in Eastern California in a popular vacation area. This volcano erupted catastrophically in prehistoric times. The area was geologically quiet for thousands of years. However, changes have occurred in recent decades
Many small earthquakes have been recorded, the volcano is releasing carbon dioxide gas, and its flanks are swelling. Scientists estimate from these observations that there is a 1 in 6 chance that the volcano will erupt at any time. 1. Should disaster officials warn the public? If so, what's the best way to explain the risk? 2. Should the area be evacuated? 3. What are some consequences of warning the public? 4. What are some consequences of not warning the public?
Burning coal, along with removing pollutants from the emissions, results in the accumulation of several substances. Which substance is not one of those pollutants?
A. radioactive radium B. uranium C. arsenic D. lead E. mercury
Which of the following immunoglobulin classes has the smallest concentration in blood serum?
A) IgA B) IgD C) IgE D) IgM
Algal blooms created from excessive agricultural and sewage runoffs are least likely to cause ____.
A. a release of waterborne and airborne toxins B. the poisoning of seafood C. a decrease in agricultural yields D. the death of some fish-eating birds E. a reduction in tourism