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Mexico, central america, and the caribbean

In 1513 Nunez de Balboa crossed the Isthmus of Panama and became the first known European to view the Pacific Ocean. Although by the end of the 15th century the Aztec Empire had passed its zenith, in 1519 there were still 60,000 households in Tenochtitlan and the population of the empire has been estimated to have been about 5,000,000 with 25,000,000 to 30,000,000 overall in Mexico. Both Mexico and Peru (as we shall see later) were very densely settled. The two American foods - maize and potatoes – were higher in caloric value than any old world crops except rice and this allowed a denser population per square mile than anyplace outside the East Asian rice-paddy region. Maize alone leads to niacin deficiency and the disease, pellagra, but middle American Indians soaked maize in a lime solution that broke down the molecules to make "hominy grits" and allowed human digestion to synthesize the needed vitamin. In some areas the native tomatoes were cultivated and eaten also and this further supplied the otherwise missing vitamins. It is of interest that in the New World, pellagra became known as "Columbus' sickness". But even before the Spaniards came, soil erosion in Mexico was already becoming a problem.

The Aztecs ate chiefly tortillas. Beans supplied some protein, the tomato (originally a weed in the maize fields) supplied vitamins A and C. They occasionally had wild game and raised small dogs for eating. This dog and the turkey were their only domesticated livestock. They also ate tadpoles, water flies' larvae, white worms, frogs, fresh water shrimp, newts, winged ants, agave worms (Maguey slug) and the iguana. We have mentioned in the last chapter that they were also somewhat prone to eat human flesh. Throughout the Caribbean people ate large, fat spiders and plump insects from decaying wood. Manioc was a Cuban poisonous plant, but properly prepared it was edible. The roots were peeled and grated and the juice squeezed out and subsequently boiled to make a harmless sauce, with the residual sediment making tapioca. The pulp was sieved and shaped into flat cakes, cooked slowly to make a soft, flexible bread called "cassava". When dried, it could be kept 2 or 3 years. The manioc root, itself, although protein deficient, was not eaten by locusts and could be left in the earth as long as 2 years, without deteriorating. (Ref. 211 )

NOTE: Insert Map 56. The Aztec, Maya and Inca Empires

Columbus and those who followed started a great exchange of foods. From Europe to the New World came wheat, chick-peas, sugarcane, some vegetables and cows. Back to Europe went maize (soon a staple in northern Spain, Portugal and Italy), potatoes (a source of vitamin C), chocolate, peanuts, vanilla, tomatoes, pineapples, lima beans, scarlet runner, red peppers, green peppers, tapioca and the turkey. (Ref. 211 ) In Mexico the climate favored the growth of many medicinal plants which were used by Aztec doctors. Among these were narcotics, medications for abortion, diarrhea, skin diseases and fever. It is interesting that the Spanish soldiers, after their arrival, of ten preferred the Aztec physicians to their European educated ones and in the latter part of the century Philip II sent one of his physicians, Francisco Hernandez, to Mexico to study native medicine and make a catalog of medicinal plants. (Ref. 125) We insert parenthetically the fact that the great majority of the Spanish troops were simple men, merely fleeing the poverty of Europe. No important Spanish family took any interest financially, militarily or intellectually in the conquest of the Americas. (Ref. 62 )

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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