Control of fire by early humans – simple english wikipedia, the free encyclopedia z gas cd juarez telefono

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The earliest evidence of humans using fire comes from many archaeological sites in East Africa, like Chesowanja near Lake Baringo, Koobi Fora, and Olorgesailie in Kenya. The evidence at Chesowanja is the discovery of red clay shards electricity flow chart that scientists estimate are 1.42 million years old. [5] Scientists reheated some of the shards at the site, and found that the clay must gas unlimited have been heated to 400 °C to harden.

At Koobi Fora, there are archaeological sites with electricity and magnetism study guide 8th grade evidence of control of fire by Homo erectus 1.5 million years ago, with the reddening of sediment that can only come from heating at 200—400 °C. [5] There is a hearth-like depression at a site in Olorgesailie, Kenya. Some very tiny charcoal was found, but it could have come from a natural brush fire. [5]

In the Middle Awash River Valley, cone-shaped depressions of reddish clay were found that could be made by temperatures of 200 °C. These features are thought v gashi 2012 to be burned tree stumps such that they would have fire away from their habitation site. [5] There are also burnt gas in babies treatment stones in the Awash Valley, but volcanic welded tuff is also in the area.

The earliest certain evidence of human control of fire was found at Swartkrans, South electricity in india Africa. Many burnt bones were found among Acheulean tools, bone tools, and bones with cut marks that were made by hominids. [5] This site also shows some of the earliest evidence of H. erectus eating meat. The Cave of Hearths in South Africa has burned deposits dated from 0.2 to 0.7 mya, as do many other places such gas knife lamb as Montagu Cave (0.058 to 0.2 mya and at the Klasies River Mouth (0.12 to 0.13 mya. [5]

The most powerful evidence comes from Kalambo Falls in Zambia where many things related to the electricity in indian states use of fire by humans had been found, like charred wood, charcoal, reddened areas, carbonized grass stems and plants, and wooden implements which may have been hardened by fire. The place was dated through gas oil ratio for leaf blower radiocarbon dating to be at 61,000 BP and 110,000 BP through amino acid racemization. [5]

Stahl thought that because some parts of plants, like raw cellulose and starch are hard to digest in uncooked form, they would likely not be a part of the hominid diet before fire could be controlled electricity and magnetism purcell. [15] These parts include stems, mature leaves, enlarged roots, and tubers. Instead, the diet was made up of the parts of the plants grade 6 electricity project that were made of simpler sugars and carbohydrates such as seeds, flowers, and fleshy fruits. Another problem was that some seeds and carbohydrate sources are poisonous. Cyanogenic glycosides, which are gas estimator in linseed, cassava, and manioc, amongst others, are made non-poisonous through cooking. [15] The teeth of H. erectus and the wear on the teeth reflect the consumption of foods such as tough meats and crisp root vegetables. [16] [17]

The cooking of meat, as can be seen from burned and blackened mammal bones, makes electricity projects for class 12 the meats easier to eat. It is also easier to get the nutrition from proteins because the meat itself is easier to digest. [18] [19] The amount of energy needed to digest cooked meat is less than that needed for raw meat, and cooking gelatinizes collagen and other connective tissues as well, it opens up tightly woven carbohydrate molecules for easier absorption. [19] Cooking also kills parasites gas x strips ingredients and food poisoning bacteria.