Answer:
It ranges from 2 to 13 km/s depends upon composition.
Explanation:
The velocity of seismic waves are different throughout the earth because of different composition of the layers inside the earth. Velocity of seismic waves increases with depth and it is approximately 2 to 8 km/s in the Earth's crust whereas, 13 km/s in the deep mantle so it means the velocity of seismic waves is higher in the mantle as compared to earth's crust due to different composition of layers between the mantle and earth crust.
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It is determined by by subtracting birth rate from death rate
The basic factors was advanced weaponry, advanced soldiers, and better systems for navigation and transportation allowing them to get the different places like America with much more ease.
