Humans affect the rate of physical weathering in several ways. The first way I am going to discuss is acid rain. Humans have increased the rate of acid rain through our use of pollutants. Cars do a lot of damage because of their exhaust fumes. The sulfur dioxide and nitrogen oxide released from the tailpipes of cars go into the atmosphere and return back to Earth in the form of acid rain, snow, fog, or dust. Factories throw away waste and release gases into the atmosphere. This affects the environment in a similar way cars do. Another way humans affect the rate of weathering is through the mass removal of vegetation. This is done when we are building highways, malls, subdivisions, and other structures. Deforestation exposes soil to high levels of rainfall and runoff, leaving areas open to wind and chemical weathering. Deforestation also exposes rocks that were once covered by vegetation. These rocks are now susceptible to all types of physical weathering, including acid rain weathering and biological weathering. Forest fires can cause the rocks that are located along the surface of the ground to weather as well.
Does anybody know the etymology of the phrase "sweet dreams"? I tried googling but did not find anything satisfying. Is this a relatively new phrase of the modern world or has this been in use for some time? I think it's the latter one. Answer The OED has the interjection as "a farewell to someone going to bed" from the 20th century: 1908 Sears Roebuck Catal. 198/1 Tenor Solos..Good Bye, Sweet Dreams, Good Bye. But it goes back until at least the 19th and possibly 18th centuries. John Wolcot, writing under the pseudonym of Peter Pindar, used it in his poem "Orson and Ellen; A Legendary Tale" published in 1801: Also from 1801 in The infernal Quixote (Page 287) by Charles Lucas: In the March 1776 of The Universal Magazine was published "The Serenade. A Pastoral Tale. From the German of Gesner" , where the shepherd Daphnis watches over his beloved as she sleeps and sings: The same tale appears in 1776's as Idyl XI, " Daphnis ...
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