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Hace 4 días · Phosphate rock mined in the United States, 1900–2015 (data from US Geological Survey) The peak phosphorus concept is connected with the concept of planetary boundaries. Phosphorus, as part of biogeochemical processes, belongs to one of the nine "Earth system processes" which are known to have boundaries.
Hace 5 días · Two notable mechanisms now exist in the United States to promote the coordination of widely-accepted standards: 1) the National Geologic Mapping Act of 1992 stipulates that necessary standards be developed by USGS and the Association of American State Geologists (AASG) to support the National Geologic Map Database (NGMDB); and 2) the Federal ...
Hace 23 horas · A 2.00 m × 1.70 m oil painting showing historical US flags. This is a list of flags in the United States describing the evolution of the flag of the United States, as well as other flags used within the United States, such as the flags of governmental agencies.
Hace 1 día · The first documented use of the phrase "United States of America" is a letter from January 2, 1776. Stephen Moylan, a Continental Army aide to General George Washington, wrote to Joseph Reed, Washington's aide-de-camp, seeking to go "with full and ample powers from the United States of America to Spain" to seek assistance in the Revolutionary War effort.
Hace 6 días · Source for all events with 'USGS' labelled as the source United States Geological Survey (USGS) Note: Magnitudes are generally estimations from intensity data. When no magnitude was available, the maximum intensity, written as a Roman numeral from I to XII, is given. See also
Hace 5 días · EarthExplorer Help Index. EarthExplorer (EE) provides online search, browse display, metadata export, data download and processing support for earth science data from the Earth Resources Observation and Science (EROS) archives of the U.S. Geological Survey (USGS). EE provides an enhanced user interface 24 hours a day, seven days a week.
Hace 6 días · Y – Vessel, liquid cargo. The US Army Corps of Engineers has a total of 11 dredge vessels, divided into hopper and non-hopper dredges. [15] In total the Corps has approximately 2,300 floating plant assets, including barges, tow boats, floating cranes, survey boats, patrol boats and dredges.
