Convection currents in the mantle still had not been discovered at the time.
Answer:
Explanation:
They usually depend on the strata, which are layers of rock, to know fossil age by looking at them, if a fossil was more on the top of the strata than another one, it’s the later one
Most of China’s ancient civilizations are hard to find mainly because of the harsh land scapes around mountains. And other areas.
occupational structure is the distribution of profession or jobs to the people in a society according to their social status, education etc.