D. For the first one
C. For the second one
Industrialization occurs when machines and industry are introduced and occur on a large scale.
Answer:
The answer is Option D. All of the above.
Explanation:
Fossils are formed when living organisms become trapped in the earth and their soft tissues decompose but leave behind the hard tissues like bone. The bones gradually become rock due to the sediments that begin to cover the bones. Therefore, the fossil remains of Lucy are no longer bones and cannot provide the organic material that is necessary when trying to achieve carbon-14 dates from an ancient site. It is also true that C-14 dating tends not to be very accurate with a specimen as old as Lucy. There are new dating techniques being experimented with all the time in this branch of research, like the 40Ar/39Ar (Argon-Argon) dating technique, but in general, scientists have used paleomagnetic studies to try to date fossil remains as old as Lucy's.
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.
