Beginning at the moment of creation with the Big Bang, Here on Earth explores the evolution of Earth from a galactic cloud of dust and gas to a planet with a metallic core and early signs of life within a billion years of being created. In a compelling narrative, Flannery describes the formation of the Earthas crust and atmosphere, as well as the transformation of the planetas oceans from toxic brews of metals (such as iron, copper, and lead) to life-sustaining bodies covering 70 percent of the planetas surface. Life, Flannery shows, first appeared in these oceans in the form of microscopic plants and bacteria, and these metals served as catalysts for the earliest biological processes known to exist. From this starting point, Flannery tells the fascinating story of the evolution of our own species, exploring several early human speciesafrom the diminutive creatures (the famed hobbits) who lived in Africa around two million years ago to Homo erectusabefore turning his attention to Homo sapiens. Drawing on Charles Darwinas and Alfred Russell Wallaceas theories of evolution and Lovelockas Gaia hypothesis, Here on Earth is a dazzling account of life on our planet.They can grow only in a temperature range of 23Ad to 104Ad fahrenheit, with an optimum of around 68Ad fahrenheit. ... of light and dark types became balanced so as to keep conditions at the surface relatively constant and within the optimum temperature range for ... of life (the exceptional 1 per cent being the noble gases such as Argon) and that Eartha#39;s oceans are maintained in their current state by life itself.
|Title||:||Here on Earth|
|Publisher||:||Grove/Atlantic, Inc. - 2011-04-05|