6000 to 12000 years ago.
A long time
a long time
60 hours.
it can take hundreds of years just to form half
2 WEEKS
This depends on what type of topsoil, its composition, the surrounding climate, etc. But usually it'll take about 800-1000 years for an inch to form.
hundreds of years
350-500 years
First you take the seed out of the pear and then you dig a hole in topsoil. After you do that you have to cover the seed up with the topsoil that you dug. Last you water the seed and let it grow!!
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about 48yr
Depending on geographic location, the natural build-up of one inch of topsoil requires about 400 - 10,000 years. Certain locations can require less, and others, even more.