You need at least 3. seismic stations provide only a circle around the station. so from geometry 3 circles intersect in a point. that is why you need 3 stations
I believe it is at least 35 feet away
1. C 2. B 3. A 4. D In that order
Answer: Some societies succeed and others fail for many reasons. They could have a bad ruler, it depends on thier rules, how the people in the society behaved, etc.
