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How many years had the Rocktopi been underground?
roughly 11000 years.
How many years did Levi coffin run the underground railroad?
40 years
How many years has London underground been open?
150
How many years does the Leo last?
the Leo last around 2165 years.
How many leaps years in the last 25 years?
There have been six leap years in the last 25.
How many years did the American Resoloution last?
i think it last 5-10 years
How many years can pennies last?
They easily last 30 to 40 years, if not longer.
How many years does it take a baby bones to develop?
Depends On Eating Habits.
For how many years does a president last?
4 years
How many years for bones to become petrified or fossilized?
To be fossilised it can take anywhere from a few decades to a couple of years.
How many countries has America invaded in the last 100 years?
70 in the last 15 years
How many dinouser bones have been found in the last 20 years?
In the last 20 years, numerous dinosaur bones have been discovered, with estimates suggesting thousands of individual bones belonging to various species. Notable finds include fossils from well-known sites like the Hell Creek Formation and the Dinosaur National Monument. However, precise figures can vary based on ongoing excavations and new discoveries. Overall, the field of paleontology continues to yield significant findings that enhance our understanding of dinosaur diversity and evolution.
