Suppose there are 10000.0 civilizations broadcasting radio signals in the Milky Way Galaxy at the moment. On average, how many stars would have to be searched before a signal is heard? Assume that there are 9 × 1011 stars in the Galaxy and one civilization per star.

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Q: Q4

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A: Volcanoes are types of geologic structures. 

Q: 2. A landslide is an example of A) river deposition B) glacial scouring C) mass movement D) chemical...

A: Since multiple questions have been asked, we will solve the first question. If you want any specific...