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Meltdown

Posted on July 3, 2010 at 8:16 am

Mush of Alaska is covered with permafrost, a layer of permanently frozen soil that lies just below the surface. Warmer temperatures are now causing the permafrost to melt in some places. As it melts, the ground softens and water wells up to the surface. Trees growing in the top soil layer tip sideways and their roots drown. Melting permafrost is creating big problems for Alaskans. Where houses were build one once-solid frozen ground, foundations are shifting and cracking. Roads are buckling and sinking. Even the Trans-Alaska Pipeline, which carries petroleum 800 miles from Alaska’s North Slope fields to the port for shipping.

Melting permafrost is also increasing the risk of erosion and landslides. Alaska’s more than 2,000 glaciers are causing worries, too. Scientists have expected the glaciers to get thinner as a result of warmer temperatures. But in 2002 studies showed than many Alaska’s glaciers are shrinking even faster that scientists had thought.

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Most enduring love

Posted on April 16, 2010 at 8:10 am

But do we must. Thankfully, sibling rivalry is “safer” than most rivalries. After all, there is rivalry between children is playgrounds and even single or only children can get into a competitive position with one or both of his parents. More conflict situations seem to arise between siblings also because they have more contact time together. Developing character and learning how to control emotions such as jealousy and temper are better tried and tested on siblings.

Once the pressure has been released, they will play together and be the best of friends. Indeed, siblings can be fun. As kids, they have their own built-in playgroups and helpers. As teenagers, sisters and brothers can be sources of potential boyfriends of girlfriends. As a cluster, they develop family identity and solidarity. The same sister who whacked me on the hand also rounded up her friends in every school election I ever ran in and told them who to vote.

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Aerometer

Posted on February 22, 2010 at 8:00 am

The aerometer also called hydrometer is an instrument for measuring the density and weight for a fluid whether gas or liquid. Its body is made of hollow tube with a widened bottom to which a weight is attached. This weight, usually lead or mercury, keeps the instrument upright when it is placed in the substances to be measured. The hollow tube narrows upward into a graduated road or stem.

The density of the liquid is determined by reading where the scale penetrates the surface of the liquid. This instrument is based on the principle of Archimedes, which states that a body immersed in a fluid is buoyed up by a force equal to the weight of the displaced fluid, this is also known as the principle of buoyancy. Since the weight of aerometer is fixed, it is possible to measure the density and weight of a fluid based on how deep the device sinks in the elements.

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The Flowers weight and life

Posted on November 9, 2009 at 7:57 am

Not all painters have been interested in the accurately copying the structure of plants. Some have been more interested in capturing feelings of life and movement. For these artists, simplicity is often more important than precise details. Chinese and Japanese artists are master of this type of painting, some of their flower paintings are detailed, true-to-life studies. But most are very different from naturalistic paintings. Yet they are just as impressive-and just as “real”. With only a few strokes of a brush, these artists can portray a flowering tree or a lush chrysanthemum.

The Impressionist artists of 19th and 20th century Europe were likewise not interested in precise details. They were much more interested in the way different light conditions changed the appearance of a subject. The characteristics of light depend on the time of day and on the weather, and the Impressionists used small dabs of unmixed color to help portray its effects.

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Enemies of the forest

Posted on October 10, 2009 at 7:55 am

Enemies of the forest include insects, disease, wildfire, air pollution and poor land-use practice. While a certain level of insect and disease damage is natural, humans have unintentionally introduced many diseases, insects and plants into the forest from foreign areas. These forest pets are called invasive exotics because they spread quickly and displace native forest vegetation. As mentioned above, wildfire is a natural part of many forest ecosystems.

However, in some forests, humans have suppressed fires for many years and large quantities of woody debris have collected on the forest floor. Fires that ignite in such forests often grow into massive and uncontrollable wildfires. These large wildfires burn most vegetation, dislocate wildfire, expose the forest soil and cause soil erosion. Large wildfires can be avoided by allowing small wildfires to burn and by setting intentional debris-reducing fires. Air pollution from burning fossil fuels has resulted in acid rain and the decline of forest health in some areas.

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