Why do stars “twinkle”?
What will be the ideal response?
ANSWER: As starlight enters the atmosphere, it often passes through regions of differing air density. Each of these regions deflects and bends the tiny beam of starlight, constantly changing the apparent position of the star. This causes the star to appear to twinkle or flicker, a condition known as scintillation.
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Which of the following is not one of the reasons that some governments feel the need to control illegal immigration?
A) Concern that migrants will themselves become a burden on public resources B) Concern that migrants will take away jobs from residents C) Concern that migrants would bring unwanted cultural change D) Concern that some migrants will be a security threat E) Concern that migrants will bring disease and infect resident population
Slate is a very fine-grained foliated metamorphic rock that commonly exhibits cleavage
Indicate whether the statement is true or false
What was blackbirding?
A) exotic birds decimated by European species B) Kanaka people kidnapped and enslaved C) colonial policies against Aboriginal people in Australia D) missionary influence on local leaders and law E) none of the above
Clouds are classified on the basis of all of these factors EXCEPT
A. altitude. B. form. C. whether the cloud is raining. D. dew point.