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TABLA PERIODICA

The periodic table of elements is the organization that, according to various criteria, distributes various chemicals according to certain characteristics.
table is usually attributed to Dimitri Mendeleev, who ordered the items based on the computational variation of chemical properties, though Julius Lothar Meyer , working separately, conducted a management from the physical properties of atoms.

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CONTAMINACION DEL AIRE

Air pollution is one of the most important environmental problems, and is the result of human activities. The causes of this pollution are diverse, but the highest rate is caused by industrial, commercial, domestic and agricultural.
combustion used for heating, generating electricity or motion, is the pollutant emission process more meaningful. Other activities such as smelting and production of chemicals that can cause the deterioration of air quality if performed without control.
Clean air is a gas mixture composed of 78% nitrogen, 21% oxygen and 1% of different compounds such as argon, carbon dioxide and ozone. We understand air pollution as any change in the balance of these components, which alter the physical and chemical properties of air.
The main air pollutants are classified as:
UNITS:
are those who remain in the atmosphere as they were issued by the source. For evaluation of air quality are considered: oxides sulfur, carbon monoxide, nitrogen oxides, hydrocarbons and particulates.
SIDE:
are those who have been subjected to chemical changes, or are the product of the reaction of two or more primary pollutants in the atmosphere. These include photochemical oxidants and some short-lived radicals such as ozone.
Nationally, air pollution is limited to areas of high population density or industrial. Annual emissions of pollutants in the country are over 16 million tonnes, of which 65% is of vehicles.
In Mexico City generates 23.6% of such emissions, 3.5% in Guadalajara, Monterrey and 3%. Other industrial centers generate the remaining 70%.

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IMPORTANCIA DE LA TRIGONOMETRIA

Trigonometry (Greek < trigōnon "triangle" + metron "measure" [1] of hence the etymological meaning becomes the measurement of triangles ). Trigonometry is a branch of mathematics read studying relationships between angles and sides of triangles. Trigonometry for this study uses the functions or trigonometric reasons which are frequently used in engineering calculations. Trigonometry applies to other branches of geometry , as is the case study areas, the geometry space.
has many applications: triangulation techniques, for example, are used in astronomy to measure distances to stars nearby in the measurement of distances between geographic points , and navigation systems, satellite .

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LA IMPORTANCIA DEL AGUA

water and landscape: Water is in many places: in the clouds, in rivers, in snow and at sea. It is also where we can not see, like air itself, in our body, food and under the earth. In addition, the water changes one place to another.
Water is necessary for the life of man, animals and plants. An important part of the wealth of a country, which is why we must learn not to waste it.
all know that water is essential for life and if we fail to take die in a few days.
70% of our body is water, water found in the blood, saliva, inside of our cells, between each of our organs, our tissues and even bones.
addition to drinking water, we humans use water in almost all our actions, ie we require to prepare food, wash clothes or dishes, grooming, irrigation, animal husbandry, manufacturing, energy production, etc.
As we know, water is a colorless, tasteless and odorless, that is, no color, taste or smell when in its highest degree of purity. It is a vital element without which life would not be possible for living beings (animals or plants).
is called the water you can drink and mineral water which flow from springs and are generally considered medicinal for certain conditions. Hard water is characterized in that, if boiled, leave in the bottom of the container a chalky residue, not used to drinking them as they do not produce lather with the soap used to wash either.
Drinking water is essential to human life, but in short supply as the population increases and because, unfortunately, is wasted by people ignorant and lacking a sense of responsibility and human solidarity. After air, water is the most essential to human existence. So it is worrying that their production and conservation is becoming a crucial issue, which is why we must begin to act.
Bring water to the city is very difficult and very expensive, almost all we eat comes from far away places. In the case of our region, water is transported from the Colorado River, near Mexicali.
all human activities in the water is this: in the city is used for food, hygiene, irrigation of parks, forests and gardens, and industrial uses.
Water has been important to our planet since life began, reflecting on history. In our country, before the English arrived the Indians worshiped Tlaloc and Chac, old gods, gods of rain, necessary for the water will not fail.
The Nahua believed that children were a gift from the gods and that before children swim in the water as jade goldfish.
The ancient Greeks believed that water was one of four basic elements of the universe. This belief traveled the world for centuries without losing momentum, today, scientists claim that water existed since the formation of the Earth and oceans that life originated.