Speakers can establish credibility by
The planet Mars is also known as the ____.
Olympus Mons, is the largest ……………. in the solar system?
Oparin's theory about 'Origin of life' is related to
Which planet is the nearest in size to Earth?
How many astronauts have walked on the moon?
Glaciers are formed by
Who was the American astronaut who returned to Earth after spending 340 days in International Space Station?
What of the following refers to hypotheses which are confirmed by varied tests?
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