Human population increases and decreases

There's so many people in the Earth we can reach to nine million by about the year of 2040. These are the factors affecting human population size which is birth rate and Death rate . The birth rate is the number of babies born in a year for every 1000 people .A high birth rate may be caused by:
            - Early marrieges
            - Lack of knowledge of birth control


A high birth rate and a low death rate will result in an increase in the size of a population. A high death rate may be caused by :
                 - Diseases
                 - Famine
                 - natural disasters


The death rate is the number of people dying in a year for 1000 people. A high death rate and a low birth rate will result in a decrease in the size of a population.

The human population may be described by its population density .When the population in a place grows , the population density of that place increase.


Population density is affected by Human migration which occurs in the form of Immigration and Emigration.People who migrate are called migrants . 
Immigration takes place when people move into a country permanently. People who Immigrate are called Immigrants . Emigration takes place when people move out of the country permanently. People who emigrate are called emigrants. 


                    




                                That's all for this now

STOP POLLUTING !

What is "Pollution" ?

Pollution is the introduction of substances that poison the environment . Pollution can come from chemical waste dumped into rivers, factories releasing toxins into the air, people burning trashes,accidents, and many other sources. Pollutants can cause diseases, including cancer, lupus, immune diseases, allergies, and asthma.Lung cancer can result from factories and car exhaust.  Contamination caused by pollution can have damaging effects in the brain and central nervous system. 

Kinds of pollution

There are many kinds of pollution it's air, water, noise, soil, radioactive, and thermal pollution but these are the common types of pollution : air pollution, water pollution and soil pollution. 

Air pollution is the introduction of chemicals and others that cause harm to humans or other living organisms, or cause damage to the environment.  These are the causes of the air pollution :

- Increased human activities

- Population growth

- Roadway construction

- motor vehicle exhaust

- Heat and power generation facilities

- Industrial processes

- Fertilizers plants

- Building demolition

- Forest fire 

Water pollution is contamination of water by foreign matter that deteriorates the quality of the water. Water pollution occurs when pollutants are discharged directly or indirectly into water bodies without adequate treatment to remove harmful compounds. It has been suggested that it is the leading worldwide cause of deaths and diseases,

 These are causes of the water pollution :

-         Waste water

-         Marine dumping

-         Industrial waste

-         Radioactive waste

-         Oil pollution

-         Underground storage leakages

-         Atmospheric deposition

-         Global warming

Soil pollution is defined as the build-up in soils of persistent toxic compounds, chemicals, salts,radioactive materials, or disease which have adverse effects on plant growth and animal health.
The causes of soil pollution are :
-   Seepage from a landfill
-  Discharge of industrial waste into the soil
-  Percolation of contaminated water into the soil
-  Rupture of underground storage tanks
-  Excess application of pesticides, herbicides or fertilizer
-  Solid waste seepage


These are the causes of pollution in my grandma's house

                               The dirty corner of the backyard.

kebab wrapper and a tissue.

This is her clean side of her backyard .

                              Make our world a better world by not causing pollutions ! 
                    LET'S REDUSE , REUSE , RECYCLE!