coal became a major energy source nearly two million years ago.
coal became a major energy source nearly two million years ago.
when did coal become a major energy source?
nearly two million years ago
the history of coal mining goes back thousands of years. it became important in the industrial revolution of the 19th and 20th centuries, when it was primarily used to power steam engines, heat buildings and generate electricity. coal mining continues as an important economic activity today. compared to wood fuels, coal yields a higher amount of energy per mass and can often be obtained in areas where wood is not readily available. though it was used historically as a domestic fuel, coal is now used mostly in industry, especially in smelting and alloy production as well as electricity generation. large-scale coal mining developed during the industrial revolution, and coal provided the main source of primary energy for industry and transportation in industrial areas from the 18th century to the 1950s. coal remains an important energy source because of its low cost and abundance compared to other fuels, particularly for electricity generation. coal is also mined today on a large scale by open pit methods wherever the coal strata strike the surface or are relatively shallow. britain developed the main techniques of underground coal mining from the late 18th century onward, with further progress being driven by 19th century and early 20th century progress. however, oil and gas were increasingly used as alternatives from the 1860s onward.
history of coal mining
yellow-band disease is a bacterial infection that spreads over coral, causing the discolored bands of pale-yellow or white lesions along the surface of an infected coral colony. the lesions are the locations where the bacteria have killed the coral’s symbiotic photosynthetic algae, called zooxanthellae which are a major energy source for the coral. this cellular damage and the loss of its major energy source cause the coral to starve, and usually cause coral death. there is evidence that climate change could be worsening the disease.









































section::::mechanism of action.
yellow-band disease