By: Sage Kalmus
We're so used to our own home environment to the air's taste and density and texture that we rarely consider what unwanted irritants have taken up residence there along with us, hiding in the air we're constantly breathing. Carbon monoxide escapes from fireplaces. Bacteria and...
What causes a volcano to erupt?
By: Rex Trulove
When examining the cause of a volcanic eruption, it is helpful to first look at the interior of the earth. At the very center of the Earth is a core of mostly iron and nickel, heated well over the melting point of either metal, but...
Understanding the three basic types of rock
By: Keith Redfern
Rocks vary in several ways. Some are soft and crumbly - others are immensely hard and resistant. Some allow water to pass through them - others are totally impermeable. Some have crystals - others don't, and some form layers or strata - others don't.In...
By: Frank Treverez
Weather is generally defined as the state of the atmosphere at a particular time and place. Often a description of the local atmosphere using the seven basic elements of weather: temperature, air pressure, humidity, visibility, wind speed, wind direction and sky conditions. Weather is very...
By: Morgan Carlson
Static means still or stationary, while electricity is a flow of electrons or current, so the two together refers to stationary electron flow, which is better understood as an electric charge. In an electric charge, electrons are exchanges from one neutral surface to another and...
The most populated cities in the world
By: C.E. Pierre
In 2009, cities are more important to the global system than ever. Urbanization is spreading, with people moving from villages and farms into towns and cities. It is estimated that half of the world's population now lives in urban areas. The world's largest cities demonstrate...
By: Morgan Carlson
The water cycle on this planet is a very important means of life for many life forms, biomes, geological stabilities, and the cleansing of the planet. As the vast majority of the planet is covered in water, there is a specific role water - or...
By: Morgan Carlson
Tidal waves, or tsunami, are waves that differ from winds caused by the gravitational pull of the Moon or oceanic winds. Although also a natural trigger, tidal waves are created by underwater disturbances or above water events. Also, tidal waves are not always a bad...
By: Tim Harry
Jewellery has always been highly sought after, and even when expensive diamonds and precious metals were too costly, cheaper materials were used to replicate the more expensive look. One stone used as a replacement for diamonds was Citrine, a much more common stone, and therefore...
By: Janet Grischy
Pumice is whipped glass. Whipped in the sense that it incorporates bubbles that make it light enough to float on water, and glass in the sense that its chemical composition is the same as that of obsidian, volcanic glass. Pumice is thrown from erupting volcanoes...

 

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