2007-03-27 16:18:19 · 6 answers · asked by subhas chandra kar 2 in Environment
1cm per 1Ma is a bit excessive. I think you need to revise your estimate. Dust accumulation on a bookshelf would be higher than that.
2007-03-27 17:44:57 · answer #1 · answered by Professor Kitty 6 · 0⤊ 2⤋
Depends where you are. Areas in the tropics that have been deforested can lose feet of soil in a few days, Arid climates like the Western US can loss up to an inch and while the Eastern US usually losses very little if there is vegetation present. The thing you have to remember is soil just doesn't go away. It gets deposited somewhere else, and in desert climates wind generally brings soil to replaces that which was washed away.
2007-03-27 16:38:25 · answer #2 · answered by Cap10 4 · 2⤊ 1⤋
I am a little worried about your sources. When you say it takes 1 million years to create a cm of top soil, what spacial scale are you looking at. In my back yard, I can create feet of topsoil in just a few years by composting.
2007-03-27 16:37:29 · answer #3 · answered by pazdon 1 · 1⤊ 1⤋
I'm suspicious of that statistic. Who made measurements a million years apart? Wouldn't the real number vary by location.
I don't know how much is lost. I know it's substantial.
2007-03-27 23:28:51 · answer #4 · answered by Anonymous · 0⤊ 1⤋
i am a bit nervous to answer this
2007-03-27 16:33:41 · answer #5 · answered by Anonymous · 0⤊ 1⤋
many
2007-03-27 16:25:40 · answer #6 · answered by Anonymous · 0⤊ 1⤋