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The document discusses issues related to global food production and consumption. It covers topics like famines, overeating, food pyramids, nutritional problems, key food sources, agricultural policies, the Green Revolution, and genetic engineering. It notes that while food production has increased to keep pace with population growth, poverty and political conflicts still threaten food security in some developing nations.
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4. Vinegar and washing soda (sodium carbonate) - Used for cleaning and removing hard water stains by neutralizing.
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The document discusses the formation of heavy elements. It begins by providing background on physical science topics like astronomy, chemistry, geology, meteorology, and oceanography. It then discusses the Big Bang Theory and how light elements like hydrogen, helium, lithium, and beryllium were formed in the early universe. The document goes on to explain that heavier elements are formed through stellar nucleosynthesis, which is the process of fusing lighter elements into heavier ones inside stars.
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The document discusses the formation of elements during stellar formation and evolution. According to the Big Bang theory, the early universe contained only light elements like hydrogen, helium, and lithium. During stellar nucleosynthesis in the centers of stars, nuclear fusion reactions produced heavier elements up to iron. Later stellar evolution and supernova explosions produced even heavier elements. Nuclear reactions and radioactive decay were later used in laboratories to synthesize new elements and fill in gaps in the periodic table.
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