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Subsidence frequently causes major problems in karst terrains, where dissolution of limestone by fluid flow in the subsurface creates voids (i.e., caves).If the roof of a void becomes too weak, it can collapse and the overlying rock and earth will fall into the space, causing subsidence at the surface.
Ancient history – Aggregate of past events from the beginning of recorded human history and extending as far as the Early Middle Ages or the Postclassical Era. The span of recorded history is roughly five thousand years, beginning with the earliest linguistic records in the third millennium BC in Mesopotamia and Egypt .
1970 Federal Home Loan Mortgage Corporation (Freddie Mac) is chartered by an act of Congress, as a GSE, to buy mortgages on the secondary market, pool them, and sell them as mortgage-backed securities to investors on the open market. The average cost of a new home in 1970 is $26,600 [2] ($167,817 in 2017 dollars).
Land subsidence outside of Ruler Foods in Belleville, Ill., where an old mine below the store caused the land surrounding the building to sink into the ground on Sept. 26, 2023.
Drivers, processes, and impacts of sinking cities [1]. Sinking cities are urban environments that are in danger of disappearing due to their rapidly changing landscapes.The largest contributors to these cities becoming unlivable are the combined effects of climate change (manifested through sea level rise, intensifying storms, and storm surge), land subsidence, and accelerated urbanization. [2]
Groundwater use and pumping in the area was the major water use for farmers and agriculture in the 1920s, and over time, this over-pumping resulted in land subsidence and a decline in groundwater-level resources. In time, this resulted in major land subsidence by the 1970s with local areas having 0.30 to 8.5 m (1 to 28 ft) of subsidence.
Median cost to purchase a home by U.S. state Median cost to purchase a home by U.S. metro area Fig. 1: Robert Shiller's plot of U.S. home prices, population, building costs, and bond yields, from Irrational Exuberance, 2nd ed. [1] Shiller shows that inflation-adjusted U.S. home prices increased 0.4% per year from 1890 to 2004 and 0.7% per year from 1940 to 2004, whereas U.S. census data from ...
July 19: Dow Jones Industrial Average closes above 14,000 for the first time in its history. [146] August: Worldwide "credit crunch" as subprime mortgage backed securities are discovered in portfolios of banks and hedge funds around the world, from BNP Paribas to Bank of China. Many lenders stop offering home equity loans and "stated income" loans.