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.
The reservation is 335 acres (136 ha) in size, and its principal feature is Walden Pond, a 64.5-acre (26.1 ha) body of water. A short way north of the pond the site of Thoreau's cabin is marked by a series of granite posts.