In the travel time chart, the lack of S-wave arrival times inside of the dashed-purple oval is evidence of a liquid inner core a liquid outer core a liquid mantle a partially melted crust a partially melted mantle a solid mantle a solid outer core a solid inner core Imagine that you are planning to conduct field work and need to record earthquakes. What is the minimum number of seismometers you will need in order to locate the earthquakes? one two three four five ten.