Water Contamination

WATER CONTAMINATION

In the developed world, regulation has restricted industry and agricultural operations from pouring pollutants into lakes, streams, and rivers. Technology has also offered a solution in the form of expensive filtration and treatment plants that make our drinking water safe to consume. Some cities are even promoting "green" infrastructure, such as green roofs and rain gardens, as a way to naturally filter out pollutants. But you may find a different picture in parts of the developing world, where there is less infrastructure—politically, economically, and technically—to deal with the barrage of pollution threats facing freshwater and all of the species that rely on it.

Fast Facts

• In developing countries, 70 percent of industrial wastes are dumped untreated into waters, polluting the usable water supply.

• On average, 99 million pounds (45 million kilograms) of fertilizers and chemicals are used each year.

• Portland, Oregon, is actively pursing “green roofs” and “green streets” to prevent sewer overflows into the Willamette River. Chicago, Illinois, now has more than 517,000 acres (209,222 hectares) of vegetated roofs—more than any other U.S. city—which are helping to catch storm water, cool the urban environment, and provide opportunities for rooftop gardens

Diseases Caused By Water Pollution:

1.     Cholera

2.      Amoebiasis (Traveller’s Diarrhea)

3.       Dysentery

4.       Diarrhea

5.       Hepatitis A

6.       Lead Poisoning                                                  

7.      Malaria

8.       Polyomavirus Infection

9.       Polio (Infantile Paralysis)

10.     Arsenicosis

11.    Fluorosis

12.    Dracunculiasis (Guinea Worm Disease)

13.    Intestinal Worms

14.    Trachoma (Eye Infection)

15.    Typhoid Fever

16.    Schistosomiasis (Bilharzia)

17.     HIV/AIDS

        Sources: http://environment.nationalgeographic.com    http://www.newhealthadvisor.com/ 

       http://www.testingbrain.com/

PYP Inquiry Cycle

Types of energy

Types Of Energy 

What is mechanical energy?

Mechanical energy is the energy that is possessed by an object due to its motion or due to its position. Mechanical energy can be either kinetic energy (energy of motion) or potential energy(stored energy of position). Objects have mechanical energy if they are in motion and/or if they are at some position relative to a zero potential energy position.

Example:

A brick held at a vertical position above the ground or zero height position.

http://www.physicsclassroom.com/class/energy/Lesson-1/Mechanical-Energy

What is electrical energy?

Matter is made up of atoms. In these atoms, there are some even small stuff called electrons that are constantly moving. The movement of these electrons depends on how much energy it has. This means every object haspotential energy, even though some have more than others.

Humans can force these moving electrons along a path from one place to the other. There are special mediums (materials) called conductors, that carry this energy. Some materials cannot carry energy in this form, and they are called insulators. We generate electrical energy whey we succeed in causing these electrons to move from one atom to the other, with the use of magnetic forces. 

Example:

Lightning is one good example of electrical energy in nature, so powerful that it is not confined to a wire. Thunderclouds build up large amounts of electrical energy. This is called static electricity. They are released during lightning when the clouds strike against each other.

http://www.eschooltoday.com/energy/kinds-of-energy/what-is-electrical-energy.html

What is chemical energy?

Chemical Energy is energy stored in the bonds of chemical compounds (atoms and molecules). It is released in a chemical reaction, often producing heat as a by-product (exothermic reaction). Batteries, biomass, petroleum, natural gas, and coal are examples of stored chemical energy. Usually, once chemical energy is released from a substance, that substance is transformed into an entirely new substance.

We just talked about the fact that plants use solar energy to make sugar from carbon dioxide and water. Sugar, carbon dioxide and water are all chemicals that are held together by what we call chemical bonds or forces that hold the chemicals together. For example, all sugars are composed of carbon, oxygen and hydrogen atoms that are held together by chemical bonds. These atoms don't just stick together automatically. Rather, energy is needed to hold them together. Plants utilize solar energy to put the carbon, the hydrogen and the oxygen atoms together in the form of sugar. 

Example:

The dry wood is a store of chemical energy. As it burns in the fireplace, chemical energy is released and converted to thermal energy (heat) and light energy. Notice that the wood now turns into ashes (a new substance)

http://www.eschooltoday.com/energy/kinds-of-energy/what-is-chemical-energy.html

http://study.com/academy/lesson/what-is-chemical-energy-definition-examples.html

NEWTON´S LAWS

CULTURAL DIVERSITY

ENERGY

What is Energy?

The simplest definition of energy is "the ability to do work". Energy is how things change and move. It's everywhere around us and takes all sorts of forms. It takes energy to cook food, to drive to school, and to jump in the air. 

What is gravity? 

Gravity is the mysterious force that makes everything fall down towards the Earth. But what is it? It turns out that all objects have gravity. It's just that some objects, like the Earth and the Sun, have a lot more gravity than others. How much gravity an object has depends on how big it is. To be specific, how much mass it has. It also depends on how close you are to the object. The closer you are, the stronger the gravity. 

What is force?
 In physics, force is a push or pull on an object. A force can cause an object to accelerate, slow down, remain in place, or change shape. 

What is work?
 We often use the word "work" in our everyday lives. For example, we would say that getting good grades in school takes a lot of hard "work". In physics, the term "work" has a specific meaning. Work, in physics, occurs when a force acts on an object to move it some distance from the start point (also called displacement). Work is calculated as the force times the distance.

Sources: http://www.ducksters.com/science/physics/work.php

Images: http://www.passmyexams.co.uk/   https://www.nasa.gov   http://highwaytomars.com/   http://rstaeletronicos.com.br/

Prezi Puberty