By: Elizabeth Nuttall
Most gems are relatively rare and this is what accounts for the monetary value of them. However, some gems are more rare than others, to such an extreme that many people have never heard of some of them. Here is an overview of the ten...
By: Mike Mwendwa
The word petrify comes from the Greek word piedra, which means rock. So when someone says they were petrified it basically means they were scared into becoming as stiff as a rock. Scary episodes are for another day but for right now we shall delve...
By: Michael Totten
All gemstones are rare. That's part of what makes them gemstones. However, some gemstones are much harder to find than others. Some gemstones can only be found in a small area. In some cases, a specific variant of a well-known gemstone is extremely rare. The...
By: Elizabeth M Young
There is no one global cooling or warming model. There are many global warming or cooling models. Most of the models have been used to process quantitative data from past observations, crunch the numbers, and produce charts, graphs and fascinating multicolored animations that show what...
How petrified wood is formed
By: Stephany Mccann
Petrified wood is a form of fossilized plant, often trees, which is created both naturally and in labs. Samples are typically millions of years old, and formed due to nearby volcanoes which supplied the ash and silica needed for petrification. One of the largest collections...
Origins and purpose of the Nazca Lines of Peru
By: T. Scott Randolph
There is a place in the high deserts of Peru, it has become known as the Nazca Lines. The unique geology of the area makes it so that figures that are carved out of the land will show up beautifully against the rest of the...
By: Cameron Scott
Neither the global warming model nor the global cooling model make weather predictions. They make climate predictions, which isn't the same thing. Climate's what you can usually expect at a particular time of year. Weather's what's happening right now. What the model says The global...
Why people should care about sustainability
By: Christyl Rivers
Why should people care whether an endangered snail goes extinct, or that another forest disappeared from earth today? Sustainability has been called the most important idea of the 21st century. It means, in the simplest terms possible, that any resource, or dynamic system, designed in...
By: Julie Thomas-Zucker
Blocking refers to atmospheric stagnation that can lead to many weather extremes like. floods, droughts, overly high or low temperatures along with other extreme weather conditions. Five different blocks occur with weather: Omega blocks, Rex blocks, Ring of Fire blocks, Split flows and Cut-off flows...
How does cloud seeding work to increase rainfall?
By: Dr Pandula Siribaddana
For many decades, scientists have experimented with producing artificial rain or snowstorms to counteract droughts or extreme temperatures experienced in different parts of the world. It is also known that Chinese officials used weather modification to stave off potential rainstorms or over-heating during the 2008...

 

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