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.
Henry David Thoreau Quotations. Thoreau was a prolific writer and is one of the most often quoted American authors. His books, essays, and journals include poignant, poetic, provocative, and timeless observations on all manner of natural history and human nature. Here, you can explore Thoreauâs wisdom through quotations organized by topic.