Dating ancient remains called

Many of the objects left behind by past human societies are not present in the archaeological record because they have disintegrated over time.The material remains that still exist after hundreds, thousands, or millions of years have survived because of favorable preservation conditions in the soil or atmosphere.Archaeologists have also recorded how primitive forms of humans spread out of Africa into Asia about 1.8 million years ago, then into Europe about 900,000 years ago.The first physically modern humans, Homo sapiens sapiens, appeared in tropical Africa between 200,000 and 150,000 years agodates determined by molecular biologists and archaeologists working together.Archaeology became established as a formal discipline in the 19th and early 20th centuries.

For instance, archaeology tells the story of when people learned to bury their dead and developed beliefs in an afterlife.

Archaeologists have documented that the development of agriculture took place about 10,000 years ago.

Early domesticationthe planting and harvesting of plants and the breeding and herding of animalsis evident in such places as the ancient settlement of Jericho in Jordan and in Tehuacn Valley in Mexico.

The archeological record encompasses every area of the world that has ever been occupied by humans, as well as all of the material remains contained in those areas.

Archaeologists study the archaeological record through field surveys and excavations and through the laboratory study of collected materials.

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