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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

Application of nanotechnology in medicine
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.
Damian
yes that's correct
Professor
I think
Professor
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
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
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
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
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
hi
Loga
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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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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