Human timeline and Nature timeline The Hadean Earth is thought to have had a secondary atmosphereformed through degassing of the rocks that accumulated from planetesimal impactors. At first, it was thought that the Earth's atmosphere consisted of hydrogen compounds— methaneammonia and water vapour —and that life began under such reducing conditions, which are conducive to the formation of organic molecules. According to later models, suggested by study of ancient minerals, the atmosphere in the late Hadean period consisted largely of water vapournitrogen and carbon dioxidewith smaller amounts of carbon monoxidehydrogenand sulfur compounds. The solution of carbon dioxide in water is thought to have made the seas slightly acidicgiving it a pH of about 5.
Sediment Transport and Deposition References 1. Lake and River Ecosystems 3rd ed.
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In Eyes on the Bay — Welcome. Sediment Transport and Deposition. In Department of State Lands: Coastal Zones and Estuaries. Sediment yield and runoff frequency of small drainage basins in the Mojave Desert, California and Nevada. Recoverability and Vulnerability of Desert Ecosystems.
Igneous, Metamorphic and Sedimentary. Is Geomorphology within Geography or Geology?. In The Association of Polish Geomorphologists. Currents and Sediment Transport in Mangrove Forests. Mangroves and Salt Marshes, 1 1. Sediment in the Gulf of Mexico. Determining the Settling Velocity.
Factors Influencing Hydraulic Roughness. In Surface Processes and Landforms. Commission on Ocean Policy.
Managing Sediment and Shorelines. An Ocean Blueprint for the 21st Century: Washington State Department of Ecology. Chapter 2 — Lakes: Total Suspended Solids and Turbidity in Lakes.
General Information on Solids. In City of Boulder: Stream Processes Part I: Alabama Department of Environmental Management: In Michigan Department of Environmental Quality. In The Bay Ecosystem.
United States Environmental Protection Agency: US Army Corps of Engineers: Hydraulic Engineering Circular No. Stream Stability at Highway Structures Fourth ed. Evaluating Scour at Bridges Fifth ed.
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