To maintain his or her standard of living, each person in the United
States requires over 22 tonnes of minerals each year:
* 5,640 kg of stone
* 4,250 kg of sand and gravel
* 430 kg of cement
* 125 kg of clays
* 180 kg of salt
* 140 kg phosphate rock
* 290 kg of non-metals
* 190 kg of iron ore
* 35 kg of bauxite (aluminium)
* 8 kg of copper
* 5 kg of lead
* 5 kg of zinc
* 3 kg of manganese
* 1 g of gold
* 13 kg of other metalsPlus:
* 3,500 kg of petroleum
* 3,500 kg of coal
* 3,100 kg of natural gas
* 150 g of uranium
Source: WorldChanging Archives
Originating Article: A Material World
By John Busby – Sanders Research Assoc (4 Feb 2008)
Hello everyone!
I’m really liking the helpfulness of this wonderful community here and I was hoping that you could provide some feedback for me.
I created a website that aims to enable students to collaborate their notes with each other and hopefully this would enhance their learning and help them become better doctors, pharmacists, engineers and etc.
Right now, the site is done the beta, but I still feel that it can be improved upon. So, I was wondering if you could provide suggestions and constructive feedback on how to improve the site. I feel that this would really help students succeed.
The site is here: Share notes
Thanks again everyone