Boiling point of water is ___.
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Glaciers are formed by
The planet Mars is also known as the ____.
In which year did Ole Romer measure the speed of light for the first time in the history?
Which is the brightest star in our night sky?
One of four words is a class to which the other three belong. Identify the class.
Which of the following is not a voluntary action?
What of the following refers to hypotheses which are confirmed by varied tests?