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America

Back to America: 3000 to 1500 B.C.

North america

The far north and canada

The Arctic Small Tool tradition continued across northern Canada to Greenland and the Pacific coast Indians continued their salmon fishing, without attempting cultivation. By 1,000 B.C. they were building villages along the Snake, Columbia and Fraser rivers south of the Snake, there were large oval dwellings with floors and a timber frame, usually about twenty-five by thirty feet. (Ref. 209 )

The united states

The Indians of North America originally had lived by hunting game and gathering wild foods, but about 3,000 years ago they began making clay vessels, an innovation that accompanied the appearance of agriculture in many areas. The pottery found in various excavation sites in the United States has a distinctive gritty temper and is often decorated with fabric or cord impressions. One village, called the Baumer site, in southern Illinois, covered more than ten acres and was made up of houses about sixteen feet square. The use of local strains of corn, beans and squash after 1,500 B.C. gave people the surplus of food and time needed to engage in some communal activities. The first signs of mound building appeared in the middle west about 1,000 B.C. as some villages began to bury their dead under low earth mounds. In the southwest the Cochise continued their gradual transition from hunter-gatherers to true farmers. (Ref. 215 , 210 )

Mexico, central america and the caribbean

Village life in Mexico continued to show more advanced societies. In the Oaxaca Valley there were villages with agriculture dominant by 1,300 B.C. Each village contained ten to twenty houses which were single family units made of wattle and daub, all opening into a common plaza. By 1,200 in San Jose Mogote in the same valley, the people began to build large platforms with limed walls and floors. (Ref. 45 , 209 ) Recent excavations at Dzibilchaltun in northern Yucatan indicate that this site, which contained one of the largest of the Mayan cities of the late post-classic period of A.D.600 or later, had been continuously occupied since 1,500 B.C., so that in all probability pre-Mayan or Mayan people lived there with an ever increasing level of civilization for over 2,000 years.

The big story of this period, however, is that of the Olmecs who had developed a civilization in the humid, low-lying, forest region of southern Veracruz and western Tabasco by 1,200 B.C. Most authorities agree (with a few dissenters) that this remarkable society appeared suddenly , without known antecedents. They were the first Meso-Americans to handle large masses of stone in monumental sculptures and they may have been responsible for extending the growth of maize in that area, chiefly by example or leadership, as they were not the basic inhabitants of the region. The latter were ethnically Huastec while the Olmecs were apparently an hereditary ruling class who promoted efficient farming techniques, long distance trade net-works, large temples and public buildings, fine art, an official state religion and social stratification. The question of pre-Columbian contacts with America has been brought up time and again, particularly regarding this advanced, suddenly appearing Olmec civilization, but the nature and method of such contact and whether or not it occurred at all, continues to be debated.

Questions & Answers

Three charges q_{1}=+3\mu C, q_{2}=+6\mu C and q_{3}=+8\mu C are located at (2,0)m (0,0)m and (0,3) coordinates respectively. Find the magnitude and direction acted upon q_{2} by the two other charges.Draw the correct graphical illustration of the problem above showing the direction of all forces.
Kate Reply
To solve this problem, we need to first find the net force acting on charge q_{2}. The magnitude of the force exerted by q_{1} on q_{2} is given by F=\frac{kq_{1}q_{2}}{r^{2}} where k is the Coulomb constant, q_{1} and q_{2} are the charges of the particles, and r is the distance between them.
Muhammed
What is the direction and net electric force on q_{1}= 5µC located at (0,4)r due to charges q_{2}=7mu located at (0,0)m and q_{3}=3\mu C located at (4,0)m?
Kate Reply
what is the change in momentum of a body?
Eunice Reply
what is a capacitor?
Raymond Reply
Capacitor is a separation of opposite charges using an insulator of very small dimension between them. Capacitor is used for allowing an AC (alternating current) to pass while a DC (direct current) is blocked.
Gautam
A motor travelling at 72km/m on sighting a stop sign applying the breaks such that under constant deaccelerate in the meters of 50 metres what is the magnitude of the accelerate
Maria Reply
please solve
Sharon
8m/s²
Aishat
What is Thermodynamics
Muordit
velocity can be 72 km/h in question. 72 km/h=20 m/s, v^2=2.a.x , 20^2=2.a.50, a=4 m/s^2.
Mehmet
A boat travels due east at a speed of 40meter per seconds across a river flowing due south at 30meter per seconds. what is the resultant speed of the boat
Saheed Reply
50 m/s due south east
Someone
which has a higher temperature, 1cup of boiling water or 1teapot of boiling water which can transfer more heat 1cup of boiling water or 1 teapot of boiling water explain your . answer
Ramon Reply
I believe temperature being an intensive property does not change for any amount of boiling water whereas heat being an extensive property changes with amount/size of the system.
Someone
Scratch that
Someone
temperature for any amount of water to boil at ntp is 100⁰C (it is a state function and and intensive property) and it depends both will give same amount of heat because the surface available for heat transfer is greater in case of the kettle as well as the heat stored in it but if you talk.....
Someone
about the amount of heat stored in the system then in that case since the mass of water in the kettle is greater so more energy is required to raise the temperature b/c more molecules of water are present in the kettle
Someone
definitely of physics
Haryormhidey Reply
how many start and codon
Esrael Reply
what is field
Felix Reply
physics, biology and chemistry this is my Field
ALIYU
field is a region of space under the influence of some physical properties
Collete
what is ogarnic chemistry
WISDOM Reply
determine the slope giving that 3y+ 2x-14=0
WISDOM
Another formula for Acceleration
Belty Reply
a=v/t. a=f/m a
IHUMA
innocent
Adah
pratica A on solution of hydro chloric acid,B is a solution containing 0.5000 mole ofsodium chlorid per dm³,put A in the burret and titrate 20.00 or 25.00cm³ portion of B using melting orange as the indicator. record the deside of your burret tabulate the burret reading and calculate the average volume of acid used?
Nassze Reply
how do lnternal energy measures
Esrael
Two bodies attract each other electrically. Do they both have to be charged? Answer the same question if the bodies repel one another.
JALLAH Reply
No. According to Isac Newtons law. this two bodies maybe you and the wall beside you. Attracting depends on the mass och each body and distance between them.
Dlovan
Are you really asking if two bodies have to be charged to be influenced by Coulombs Law?
Robert
like charges repel while unlike charges atttact
Raymond
What is specific heat capacity
Destiny Reply
Specific heat capacity is a measure of the amount of energy required to raise the temperature of a substance by one degree Celsius (or Kelvin). It is measured in Joules per kilogram per degree Celsius (J/kg°C).
AI-Robot
specific heat capacity is the amount of energy needed to raise the temperature of a substance by one degree Celsius or kelvin
ROKEEB
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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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