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What are the disadvantages of landfills?

Trash normally contains a huge amount of toxic chemicals, such as mercury, arsenic, lead and PVC. These toxins build up in the landfill over time and have the potential to pollute and cause severe damage to the surrounding area if they are not contained. Another potentially major source of pollution is leachate, which is the highly toxic liquid that forms as trash breaks down.\nLandfill gas, which refers to the huge amounts of carbon dioxide, methane and other harmful greenhouse gases produced during decomposition, is another problem. In addition to harming the environment, methane is incredib..

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What are some facts about the temperature of the Atlantic Ocean?

Atlantic Ocean temperatures are warmest around the equator where the water absorbs the maximum amount of sun. Scientists have measured average temperatures for surface waters in the Persian Gulf at about 36 degrees Celsius. Conversely, average temperatures for the Atlantic Ocean in polar regions, which receive less sun, run as cold as minus-2 degrees Celsius, which is cold enough for the formation of surface ice.\nIn deeper waters, the Atlantic Ocean is universally cold. Water is denser near the bottom of the ocean and circulates less aggressively, leading to consistent temperatures of anywher..

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Where can you find some general questions and answers for biology quizzes?

These sites offer reliable general knowledge of biology suitable for an entrance exam. Biology is a wide subject so the sites strive to make the quizzes as relevant as possible. The sites have easy-to-use designs. For example, they give multiple choice answers next to the questions. In addition, users can air their views through discussion forums, providing opportunities to dispute the answer given to a certain question or to add to it.

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What is an example of something exerting a force?

In physics, force is defined as any external application of energy that changes something about the location, direction, velocity or condition of an object. An external force can come from a person, a machine or any number of different sources. The formula for calculating force is F = ma, or "force equals mass times acceleration." Acceleration can only be measured in terms of movement, so if the object being influenced remains motionless, the force is technically calculated as zero, no matter how much effort is being expended. Pushing, pulling, lifting and kicking are all examples of an applie..

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What are five kinds of snow crystals?

Stellar dendrites are one of the more famous types of snow crystals, and are the type usually seen in holiday decorations. The word "dendrite" means "tree-like," and these crystals get their name from their branches and side branches. When the crystals become large enough to have many side branches, they are considered fern-like stellar dendrites, which is the largest type of snow crystal. Radiating dendrites can occur in certain conditions when extra dendrites form above or below the plate.\nCapped columns are a very unique snow crystal that consist of two plates at each end of a short column..

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What are some anti-litter slogans?

The "Don't Mess With Texas" slogan used by Texas was created in 1985 by the GSD&M ad agency. The firm was hired by the state transportation agency to encourage drivers to keep the roads clean. The slogan was embraced by Texans because it evoked feelings of state pride. Many outside of Texas believe it is a local saying that espouses the state's independent nature, not words created for an advertising campaign. The slogan is credited with reducing littering by 71 percent in just four years.\nMany states use the slogan "Keep [State Name] Beautiful." Some American cities have adopted th..

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What is the shortest muscle in the body?

The stapedius and stapes function to dampen vibrations. Without them, the human voice would become overwhelming and would drown out other sounds in the environment. Because the stapedius is connected to facial nerves and muscle, damage to the face can cause a condition in the ear known as hyperacusis. When the stapedius does not work, sounds become amplified.

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What is a mesa landform?

Mesas are made of layers of compressed sedimentary rock capped with a harder layer of rock that is resistant to erosion. This top layer is often a layer of cooled and hardened lava. The sedimentary layers below are softer and, over time, wear away with erosion.\nEnvironmental forces shape these landforms and their surrounding areas. Mesas are generally found in areas that receive 20 inches of rain or less per year. When these arid and semiarid regions do get rain, they are pounded by sudden, heavy downpours. The water tends to evaporate quickly in these dry areas, limiting vegetation at the me..

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What are spectator ions?

Ionic compounds are composed of negative anions and positive cations. When these compounds are formed, opposites are often used as spectator ions. Spectator ions are responsible for keeping the solution electrically neutral, while the player ions are the ones that undergo change.When writing a chemical equation, all spectator ions are normally removed to condense the equation down to only reactive ions. For example, when combining silver and chloride, nitrate is paired as an anion with silver and sodium as a cation with chloride. After removing the spectator ions, which have undergone no chang..

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What measurable information can be obtained from studying the water cycle?

As of 2015, scientists study the global water cycle with the help of a number of orbiting satellites. These satellites collect information about the state of all the water on Earth. At any given time, that information includes the amount of water vapor in the air, the amount of solid sea ice at the poles, the amount of water contained within clouds and the size of the particles therein. Increased water vapor in the air may contribute to overall global warming. A satellite measures the amount of water vapor in the atmosphere as well as the overall temperature, thus allowing any existing correla..

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