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Chapter 2: 8th, 7th,&6th millennia b.c.

Backward to Beginning to 8000 B.C.

8,000 to 5,000 b.c.-from hunting to agriculture

Although technically this period to be discussed is still prehistorical from the standpoint of its preceding man's ability to write and therefore narrate his exploits, archaeological excavations and other studies have pin-pointed so many activities that it seems worth while to give a separate chapter to these three millennia. In this period there were weather oscillations with rapid changes in climate and corresponding changes in flora and fauna but over all there was improvement toward a more temperate situation. Domestication of some animals occurred and there was early plant cultivation. Domestication involves selective breeding and genetic change so that some species become completely dependent on man's intervention for survival. The yield from cultivated cereals made possible human communities of a larger size than ever before, and thus for the first time there arose settlements which can be described as villages or even towns. The earth's population at 8,000 B.C. has been estimated at 5.3 million (Ref. 222 ). The changed distribution of rainfall and the changes in sea and lake levels after that date necessitated a greater use of the grasses which abounded in the mountain foothills and the selection of certain forms which could be grown in lowland habitats as potential crops. As mankind began to leave food-gathering for an agricultural way of life, 99% of the time during which mankind has existed had already passed. (Ref. 8 , 215 , 221 )

Forward to 5000 to 3000 B.C.

    Choose different region

  • Africa
  • America
  • Central and Northern Asia
  • Europe
  • The Far East
  • The Indian Subcontinent
  • The Near East
  • Pacific

Questions & Answers

what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
yes that's correct
I think
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
how nano science is used for hydrophobicity
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
what is differents between GO and RGO?
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
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Source:  OpenStax, A comprehensive outline of world history. OpenStax CNX. Nov 30, 2009 Download for free at http://cnx.org/content/col10595/1.3
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