The boundaries between all of these plates are best described as the sites of

The correct answer should be Fault lines. These are lines that occur at boundaries of tectonic plates and they can either be convergent meaning that the plates move towards each other or they can be divergent meaning that the plates move away from each other. They can also just rub against each other and cause things like earthquakes.

So are u adding some additional catalyst

Year  1936,  lehman predicted that the earths 'inner core' is solid. she observed that the seismic signals during her study were bent and did not pass through instead bouncing back. later it was confirmed that the earth's inner core was solid made up of nickel-iron and had a molten outer core.