Agricultural Revolution, A time when humans changed from hunting and gathering to farming. People learned to grow crops and raise animals, which increased food supply and allowed populations to grow., Desertification, The process where fertile land becomes dry and desert-like. This usually happens because of overfarming, overgrazing, cutting down trees, or climate change., Technological Revolution, A period when new inventions and machines rapidly changed how people live, work, and communicate. Examples: computers, phones, electricity., Medical Revolution, A period when major medical discoveries—like vaccines, antibiotics, and modern sanitation—helped people live longer and healthier lives, reducing death rates., Industrial Revolution, A period when people moved from hand-made goods to machine-made goods. Factories, steam engines, and mass production began, increasing pollution and changing society., Negative Externalities, Unwanted harmful effects from an activity, like pollution from a factory., Innovation, A new idea, method, or invention that improves how something works or solves a problem. ex,solar panels, electric cars, new farming tools.

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