วันพฤหัสบดีที่ 17 พฤศจิกายน พ.ศ. 2559

Acid rain is a rain or any other form of precipitation that is unusually acidic, meaning that it possesses elevated levels of hydrogen ions (low pH). It can have harmful effects on plants, aquatic animals and infrastructure. Acid rain is caused by emissions of sulfur dioxideand nitrogen oxide, which react with the water molecules in the atmosphere to produce acids. Some governments have made efforts since the 1970s to reduce the release of sulfur dioxide and nitrogen oxide into the atmosphere with positive results. Nitrogen oxides can also be produced naturally by lightningstrikes, and sulfur dioxide is produced by volcanic eruptions. The chemicals in acid rain can cause paint to peel, corrosion of steel structures such as bridges, and weathering of stone buildings and statues.

The Effects of Acid Rain on Ecosystems


An ecosystem is a community of plants, animals and other organisms along with their environment including the air, water and soil. Everything in an ecosystem is connected. If something harms one part of an ecosystem – one species of plant or animal, the soil or the water – it can have an impact on everything else.

Acid Rain is Caused 
Nature depends on balance, and although some rain is naturally acidic, with a pH level of around 5.0, human activities have made it worse. Normal precipitation—such as rain, sleet, or snow—reacts with alkaline chemicals, or non-acidic materials, that can be found in air, soils, bedrock, lakes, and streams. These reactions usually neutralize natural acids. However, if precipitation becomes too acidic, these materials may not be able to neutralize all of the acids. Over time, these neutralizing materials can be washed away by acid rain. Damage to crops, trees, lakes, rivers, and animals can result.

วันพฤหัสบดีที่ 1 กันยายน พ.ศ. 2559


Food chain




             producer                                                  

                                   





                 



                                                          consumer


วันพุธที่ 27 กรกฎาคม พ.ศ. 2559

วันพฤหัสบดีที่ 21 กรกฎาคม พ.ศ. 2559

World's Deadliest - Tiger vs. Deer




Tiger attacking the victim when the victim is unconscious , no direct confrontation .
2Tigers kill prey by biting the neck bones crack and split .
3After that, it will bring in its prey to eat .