Which essay did andrew carnegie write?

"the origin of species"
"the gospel of wealth"
"social darwinism"
"the truth about standard oil"

Andrew Carnegie wrote "The Gospel of Wealth". The essay is also called "Wealth" and was written on June of 1889. This described the responsibility of philanthropy of those in the upper class because of their self-made richness. 

To form soil, the two processes which must occur are erosion and weathering, so the correct answer is "soil formation is a continuous presses, but also one which takes a long time, it can sometimes take more than five hundred years for 1cm of soil to form.