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Water Pollution is the contamination of water bodies. It occurs as a result of introduction of pollutants in water. Water is life. Still, we contribute in polluting the water bodies in several ways.
Water Pollution is mainly caused as a result of improper discharge of household and industrial chemicals wastes into the water bodies.
These dangerous chemicals (in the form of solid, liquid or gases) mixes with water and make it unsafe for living bodies. Water pollutants cause harm to human-beings, animals, trees and other constituents of environment.
Water Pollution is the contamination of water bodies. It occurs as a result of introduction of pollutants in water. Water is life. Still, we contribute in polluting the water bodies in several ways.
Water Pollution is mainly caused as a result of improper discharge of household and industrial chemicals wastes into the water bodies.
These dangerous chemicals (in the form of solid, liquid or gases) mixes with water and make it unsafe for living bodies. Water pollutants cause harm to human-beings, animals, trees and other constituents of environment.........
2/ ENVIRONMENT
Nowadays, our natural environment is suffering more and more the terrible human impact. At the moment, there are a lot of environmental problems, like desforestation, the destruction of the ozone layer, acid rain, the greenhouse effect, pollution in the air with traffic humes, and harmful chemicals which are released into the atmosphere, pollution in the rivers and oceans with illegal effluents, sewage spills, industrial waste, drinking water is being contamined due to river pollution…. (and so on)….
All this take parts of a terrible situation and involves awful drawbacks in our planet. The destruction of the rainforest carries many animals are wiped out, fish supplies are depleted through overfishing, pollution is very harmful for us, besides, there are methods of electricity generation (which emit greenhouse gases), and contribute to global warming.
Our governments have to improve their natural measures. It is important to support alternative source of power, like solar stations, wind power… These one should be easy to live and work with, safe, practical, cheap and clean. On top of that, they are higly productive and friendly with the planet. Besides, our goverments should have stricker laws and hard punishments for illegal hunting, encourage countries to control the number of trees are cut down, reduce gases emitted from factories (and so on)…
On the other hand, we all have to be aware about this problem, and contribute to conserve our planet, like: switch off the lights, ride a bicycle, insulate our houses, use public transport, use less petrol and electricity, save on water, recycle our rubbish ….. In this way, we all can contribute to conservate our environment and wildlife.
Our environment affects all of us. We share the same planet. We all have to be aware of the necessity of improve our natural world. The environmental organizations play an important role, but we all can do a little effort in being much more ecological.
(*Nota: El tema de “Environment” es un poco lioso. No hace falta estudiarse conceptos muy específicos ni ser un especialista en la materia. Sólo llevar las ideas claras y además que esas ideas sean muy sencillas. No hace falta entrar en mucha materia).
5/ Learning is often considered to be a normal part of working and personal life. Both learning for achieving a job as well as for achieving knowledge should not be neglected. Online environment is changing continuously and it represents a great opportunity for learning. It is very important to discover how to learn using all available communicatio
Online Learning Advantages and DisadvantagesNowadays, online learning turns out to be more and more practiced. Many traditional universities started to share their courses online for free. It represents an easy and comfortable method to achieve knowledge in almost every field, from law and accounting, to human sciences, such as psychology and sociology or history. Online learning is a great alternative to traditional universities, especially for people who can’t afford the time and money to take real courses.
Advantages of Online LearningAlthough many people still consider traditional universities as the best way to achieve knowledge and get a diploma, online learning proves to be a great alternative. Students have the chance to study in their own time and especially for free. It represents a great way to study many fields and to boost the level of self-motivation. Online learning is so effective because students can finish their homework quickly, and there is more time left for hobbies or for finding a job.
An access to all resources of a traditional course helps participants learn wherever they are, leaving them the freedom to choose the time for study. With basically an Internet connection, a person can attend different courses. Among the advantages of online learning there are the responsibility and self-discipline of students.
Disadvantages of Online Learning
Only in a small group a person can develop properly. At school, students learn how to make friends, be patient, get rid of disappointment, and especially to compete. Competition between colleagues can be very stimulating and students will only benefit from it. Online learning cannot offer human interaction.
Another disadvantage refers to the fact that online courses cannot cope with thousands of students that try to join discussions. Also, online learning can be difficult, if it is meant for disciplines that involve practice.
In conclusion, online learning should be seen as a complement and extension of classical forms of learning. Not even the best online course can fully replace the personal contact with a teacher, or the human relationships that develop in a group. So, traditional classes shouldn’t be replaced with online learning.
n channels and choosing the ones that best suit a person’s style of filtering the information.
1.Water Pollution is mainly caused as a result of improper discharge of household and industrial chemicals wastes into the water bodies.
These dangerous chemicals (in the form of solid, liquid or gases) mixes with water and make it unsafe for living bodies. Water pollutants cause harm to human-beings, animals, trees and other constituents of environment.
The sources, effects, and control measures of Water Pollution are discussed below.
Effect of water pollution on human health- Presence of toxic metals in water may cause skin disease, dysentery, amoebiasis, anorexia, etc.
- Radioactive substances present in water may lead to radioactive pollution causing cancer.
- In polluted water the different water borne virus, bacteria, and protozoa are present. They cause small diseases likely pox, chicken pox, dysentery, amoebiasis, tuberculosis etc.
- The toxic industrial and agricultural runoff should be properly treated before mixing with water sources.
- Drinking water should be properly treated to make it free from any germs.
- The sewage system should be much more scientific.
- The waste water should be purified before it goes to the river.
- The toxic chemicals from industries should be properly treated prior to discharge into the environment.
- Cultivation of Salvinia and Azolla in the pond or lake can fix toxic metal and hence metal pollution can be reduced.
- The domestic or household effluents should be discharged properly.
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Environmental pollution is the status of environmental contamination by chemical, biological ... affect human health, other living organisms.Environmental pollution is caused by humans and human management.
The main types of pollution :
- Air pollution : Smoke and dust discharge chemicals into the atmosphere. Examples of toxic gases as carbon monoxide, sulfur dioxide, cloroflorocacbon substances (CFCs) and nitrous oxide are of industrial waste and vehicle
- Water pollution occurs when surface water flows through the domes waste, industrial waste water, pollutants in the ground, and groundwater seepage.
- Soil pollution occurs when soil contaminated with toxic chemicals (concentrations exceed normal limits) by the activities of man as active mining, industrial production and use of chemical fertilizers Study or too much peside, ... or leaks from underground storage tanks. Most common types of soil contaminants are hydrocarbons, heavy metals, MTBE, herbicides, pesides, and chlorinated hydrocarbons .
- Radioactive Pollution , Noise pollution , Light Pollution ...
Affecf :
+ For human health : Air pollution can kill many living organisms including humans. Ozone pollution can cause respiratory disease, cardiovascular disease, inflammation of the throat, chest pain, breathlessness. Water pollution causes approximately 14,000 deaths per day, mainly by eating contaminated with untreated water. Chemicals and heavy metals contamination in food and drink can cause cancer. Oil spills can cause itching blisters. Noise pollution causes hearing loss, hypertension, depression, and insomnia., causing serious consequences .
+ For ecosystem :
- Sulfur dioxide and nitrogen oxides cause acid rain can reduce soil pH.
- Contaminated land may become barren, not suitable for crops. This will affect other living organisms in food webs.
- Smoke and fog reduce sunlight that plants receive to make the process of photosynthesis.
- Invasive species that can compete and occupied habitat for endangered native species, thus reducing biodiversity.
CO2 generated from the factories and passing vehicles also increases the greenhouse effect. Earth on a heating up. Gradually destroying the natural resort where it is available.
Solutions to limit environmental pollution :.
- Combat desertification and silver color.
- Natural water treatment contaminated ...
- Purify air ...
DỊCH :
Ô nhiễm môi trường là tình trạng môi trường bị ô nhiễm bởi các chất hóa học, sinh học... gây ảnh hưởng đến sức khỏe con người, các cơ thể sống khác . Ô nhiễm môi trường là do con người và cách quản lý của con người.
Các dạng ô nhiễm chính :
- Ô nhiễm không khí, việc xả khói chứa bụi và các chất hóa học vào bầu không khí. Ví dụ về các khí độc là cacbon mônôxít, điôxít lưu huỳnh, các chất cloroflorocacbon (CFCs), và ôxít nitơ là chất thải của công nghiệp và xe cộ .
- Ô nhiễm nước xảy ra khi nước bề mặt chảy qua rác thải sinh hoạt, nước rác công nghiệp, các chất ô nhiễm trên mặt đất, rồi thấm xuống nước ngầm.
- Ô nhiễm đất xảy ra khi đất bị nhiễm các chất hóa học độc hại (hàm lượng vượt quá giới hạn thông thường)do các hoạt động chủ động của con người như khai thác khoáng sản, sản xuất công nghiệp, sử dụng phân bón hóa học hoặc thuốc trừ sâu quá nhiều,... hoặc do bị rò rỉ từ các thùng chứa ngầm. Phổ biến nhất trong các loại chất ô nhiễm đất là hydrocacbon, kim loại nặng, MTBE, thuốc diệt cỏ, thuốc trừ sâu, và các hydrocacbon clo hóa .
- Ô nhiễm phóng xạ , Ô nhiễm tiếng ồn , Ô nhiễm ánh sáng ...
Ảnh hưởng :
+ Đối với sức khỏe con người : Không khí ô nhiễm có thể giết chết nhiều cơ thể sống trong đó có con người. Ô nhiễm ozone có thể gây bệnh đường hô hấp, bệnh tim mạch, viêm vùng họng, đau ngực, tức thở. Ô nhiễm nước gây ra xấp xỉ 14.000 cái chết mỗi ngày, chủ yếu do ăn uống bằng nước bẩn chưa được xử lý. Các chất hóa học và kim loại nặng nhiễm trong thức ăn nước uống có thể gây ung thư. Dầu tràn có thể gây ngứa rộp da. Ô nhiễm tiếng ồn gây điếc, cao huyết áp, trầm cảm, và bệnh mất ngủ., gây nhiều hậu quả nghiêm trọng .
+ Đối với hệ sinh thái :
- Điôxít lưu huỳnh và các ôxít nitơ có thể gây mưa axít làm giảm độ pH của đất.
- Đất bị ô nhiễm có thể trở nên cằn cỗi, không thích hợp cho cây trồng. Điều này sẽ ảnh hưởng đến các cơ thể sống khác trong lưới thức ăn .
- Khói lẫn sương làm giảm ánh sáng mặt trời mà thực vật nhận được để thực hiện quá trình quang hợp .
- Các loài xâm lấn có thể cạnh tranh chiếm môi trường sống và làm nguy hại cho các loài địa phương, từ đó làm giảm đa dạng sinh học.
Khí CO2 sinh ra từ các nhà máy và các phương tiện qua lại còn làm tăng hiệu ứng nhà kính. Trái Đất ngày một nóng dần lên. Phá hủy dần các khu du lịch tự nhiên mà nó sẵn có.
Giải pháp để hạn chế ô nhiễm môi trường :
- Giảm độ mặn cho đất.
- Xử lý nước tự nhiên bị ô nhiễm.
- Làm trong sạch không khí ..
Fresh water is the most important source of life on the earth. Any living thing may survive without food for days however it is impossible to imagine life without water and oxygen. The ever increasing human population enhances the demand of more water for purposes like drinking, washing, performing industrial processes, irrigating crops, arranging swimming pools and other water-sports centres. Water pollution is done by the people of all over the world because of increasing demands and competitions of luxuries life. Waste products from many human activities are spoiling the whole water and decreasing the amount of oxygen available in the water. Such pollutants are altering the physical, chemical, thermal, and biological characteristics of the water and adversely affecting the lives inside as well as outside the water.
When we drink the polluted water, harmful chemicals and other pollutants goes inside our body and deteriorates all the body organs functioning and puts our lives in danger. Such harmful chemicals also disturb the lives of animals and plants greatly. When plants absorb dirty water through their roots, they stop growing and die. Thousands of seabirds are killing because of the oil spilling from ships and industries. High level of water pollution is done due to the chemicals coming out of the agricultural usage of fertilizers, insecticides and pesticides. The effect of water pollution varies from place to place upon the type and amount of water contamination. The degradation of drinking water needs an urgent basis prevention method which is possible by the proper understanding and support from the end of each and every person living on the earth.