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The Ogallala Aquifer (oh-gə-LAH-lə) is a shallow water table aquifer surrounded by sand, silt, clay, and gravel located beneath the Great Plains in the United States. As one of the world's largest aquifers, it underlies an area of approximately 174,000 sq mi (450,000 km 2) in portions of eight states (South Dakota, Nebraska, Wyoming, Colorado, Kansas, Oklahoma, New Mexico, and Texas). [1]
A hydrogen fuel cell power plant is a type of fuel cell power plant (or station) which uses a hydrogen fuel cell to generate electricity for the power grid.They are larger in scale than backup generators such as the Bloom Energy Server and can be up to 60% efficient in converting hydrogen to electricity.
A study released by Moody's found two-thirds of the 381 largest metropolitan areas in the United States were in a recession. The study also said 28 states were in recession, with 16 at risk. The findings were based on unemployment figures and industrial production data. [28]
Another major advantage enjoyed by the United States was the absence of an aristocracy or gentry. The eastern seaboard of the United States , with a great number of rivers and streams along the Atlantic seaboard, provided many potential sites for constructing textile mills necessary for early industrialization.
Data from the United States Office of Management and Budget archives. National defense spending is any government spending attributable to the maintenance and strengthening of the United States Armed Forces, including the Army, Navy, Marines, and the Air Force. [14]
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.
Climate change has led to the United States warming by 2.6 °F (1.4 °C) since 1970. [3] The climate of the United States is shifting in ways that are widespread and varied between regions. [4] [5] From 2010 to 2019, the United States experienced its hottest decade on record. [6] Extreme weather events, invasive species, floods and droughts are ...
Water resources are natural resources of water that are potentially useful for humans, [1] for example as a source of drinking water supply or irrigation water. 97% of the water on Earth is salt water and only three percent is fresh water; slightly over two-thirds of this is frozen in glaciers and polar ice caps. [2]