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Published byDestini Hardison Modified over 10 years ago
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Life on Earth 1.3
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A Short History of Life on Earth The earliest life forms appeared on Earth 3.5 billion years ago It took another 3 billion years for human history to begin Early Homo sapiens were called Cro- Magnons Early humans depended on their environment to survive
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Homo sapiens Species of humans Affected their environment Found 3 main ways to survive: As hunters and gatherers By farming the land By using machines to produce what is needed
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Living off the Land The first humans lived in small groups As seasons changed, they moved from one place to another to find food They were called hunter-gatherers, which means they survived by hunting and collecting Humans lived this life for most of human history
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Hunter-gatherers Knew a lot about their environment Knew which plants could be eaten and where to catch animals This info was passed down from one generation to the next Small groups at first, but as their numbers grew, so did their impact on the environment Would hunt species faster than they could reproduce
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Agricultural Revolution A period in history when hunter-gatherers learned to farm and raise animals for food People started to stay in one place rather than move with the seasons Farming supports 500 times more people than hunting and gathering The number of people quickly increased
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People and Agriculture Agricultural Revolution changed people’s diets People started eating grains (wheat, barley, rice, corn) Farming communities thrived, people worked to build cities New problems: waste removal, clean water
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Industrial Revolution A period in history when humans started using machines to produce food and other products Mid-1700’s; Invention of steam engine Allowed factories to mass-produce clothes, building materials and equipment Made farming and transportation more efficient
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Positives Fewer people were needed to produce goods Goods cost less being mass-produced (produced in large quantities by machine) New inventions made people’s lives easier Elec. Lights, cars, computers More people could live in the same area
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Negatives Environmental problems Large-scale farming led to a loss of habitat for many animals Pollution from farms and factories (air, water) Machines required more energy and resources Population Increase (pg. 15)
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Vocabulary Hunter-gatherer Agricultural Revolution Mass-produce Industrial Revolution Pollution
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