On Thursday, October 24, 1929, where the New York Stock Exchange lost industries and companies.

On Thursday, July 4, 1776, when the United States became independent.

On Wednesday, July 16, 1969, when apollo 11 was launched.

The presidents' greed for money.

Because New York was at that time the largest stock market in the world and brought with it the ruin of many investors.

Because people wanted it that way.

The robberies began.

People claimed their money because they lost their savings.

Savers decided en masse to withdraw their savings, which meant the bankruptcy of many banks.

They decided to close their doors.

It meant the disappearance of many strong industrial and commercial companies and strong banks which resulted in the unemployment of 15 million people in the US.

It meant the separation of Europe from the United States because it was in an economic crisis and that did not bring them anything, because it was one more burden that they had to assume.

I create nursing homes.

Employed many people, even with low wages.

Established public dining rooms.

Undertaken works such as large hydroelectric plants and roads.

Started investing again.

Donald Trump.

Joe Biden.

Franklin D. Roosevelt.

John F. Kennedy.

Barack Obama.

More than 70% of people were unemployed in Latin America.

The United States stopped buying products from Latin America.

8 out of 10 poor people do not have to eat.

Apple, pear, grape, bean.

Rice, tomato, carrot, mango.

Coffee, banana, wood, wheat.

Russia, England, France, Germany, Australia.

Chile, Mexico, Colombia, Peru, Brazil.

Costa Rica, Japan, China, Korea, Canada.

Guatemala, Nicaragua, Honduras, Panamá, Argentina.

It represents the amount of matter that a given substance sample contains and is the measure of inertia. Inertia is a fundamental property of matter, which can be described as its resistance to changing its motion.

It is an expression of an atom's greed for electrons when they are part of a chemical compound (molecules). The greater the electronegativity of an atom, the greater its electron-scavenging capacity.

It is the relationship between the mass of a body and the volume that the body occupies. It is usually expressed in g / mL, kg / L or g / cm3.

It is a physical property that expresses the extension of a body in only one dimension: the length.

It is a chemical reaction in which an atom gains electrons, transferred by a reducing agent.

It is a force, the one that the Earth exerts on any object close to its surface.

It is a measure of the internal energy of objects. A substance is made up of atoms and molecules with their own vibrational movement and the greater this movement, the more temperature the body has.

It is the space occupied by a body, which has three dimensions: length, width and height. Volume is measured in cubic meters (m3), cubic centimeters (cm3), liters (l), milliliters (ml), etc.

It is the property of certain substances to burn when they reach a favorable condition for it, both in temperature, pressure and concentration. There are highly flammable substances, such as ethyl ether, that are capable of emitting vapors, which makes their use very dangerous.

It is the property of some metals to be used for the manufacture of very thin fibers. For example, copper is used in the form of fibers or wires in cables for the transmission of electric current.

It is the relationship between the mass of a body and the volume that the body occupies. It is usually expressed in g / mL, kg / L or g / cm3.

It is a solution indicates the relationship between the mass of the solute and the volume of the solution.

It is a physical property related to the amount of heat in a body. It is expressed in degrees Celsius, Fahrenheit, or Kelvin. For example, body temperature normally oscillates around 37ºC.

Minimum freezing point of a substance.

It's the amount of matter a body has.

It is the space occupied by a body, which has three dimensions: length, width and height.

It is related to the sensation that a food or drink produces when it comes into contact with the taste buds. There are 4 basic flavors: sweet, salty, bitter, and sour.

It is a chemical reaction of an acid with sodium carbonate or sodium bicarbonate, which produces the release of carbon dioxide gas, which rises to the surface of the water in the form of bubbles.

This physical property is based on the ability of the elements to conduct electric current through themselves.

It is the quality that an object or body has of dividing itself into other parts.

It is the property that objects or bodies have to remain in their state of rest.

Maximum heating point of a substance.

It is a chemical reaction where a substance burns in the presence of oxygen. The complete combustion of organic compounds (sugars, proteins, lipids, etc.) generates the gas carbon dioxide and water.

It is a property contrary to viscosity: fluids with low viscosity can flow freely, since they do not find resistance to do so. This is the case with water and many other liquids.

It is the force that is exerted on a surface. When a balloon is inflated, the air exerts a force on the surface of the balloon, an example of pressure.

It is the temperature at which a substance changes from liquid to gaseous. For example, the boiling temperature of water is 100ºC.

It is the temperature at which a substance changes from a solid to a liquid state. For example, the melting temperature of copper is 1085ºC

Although it is not a chemical reaction, it has to do directly with the stability of the atomic nucleus to decompose and emit radiation of different energies.

Indicates the amount of acid in a substance. An acid is a chemical that emits hydrogen ions into water and forms salts when combined with certain metals. Acidity is measured on a scale called the pH scale.

This property describes the ease of a material to be laminated. It refers mostly to metals such as gold, the most malleable of all, followed by aluminum, lead, silver, copper, and more.