Composition of Earth's atmosphere by volume. The lower pie represents the trace gases that together compose about 0.038% of the atmosphere (0.043% with CO2 at 2014 concentration). The numbers are from a variety of years (mainly 1987, with CO2 and methane from 2009) and do not represent any single source.
User: How long did Thoreau live in the woods at Walden Pond? User: How long did Thoreau live in the woods at Walden Pond? Weegy: Thoreau lived in the woods at Walden Pond for two years, two months, and two days.
Thoreau's older siblings, Helen and John, Jr., were both schoolteachers; when it was decided that their brother should go to Harvard College, as had his grandfather before him, they contributed from their teaching salaries to help pay his expenses, at that time about $179 a year.