Because they are not man made and are part of the earth's natural features caused by the the weathering and erosion of the earth.
Answer:
False
Explanation:
The Rio Grande rift is one of the major continental rifts in the world where the continental crust is being heated and stretched from below
Answer:
Scientists used major changes in life forms in the fossil record to form the geologic time scale.
In official Chinese histories, the Yuan dynasty bore the Mandate of Heaven. The dynasty was established by Kublai Khan, yet he placed his grandfather Genghis Khan on the imperial records as the official founder of the dynasty and accorded him the temple name Taizu.
