Seismic tomography is a technique for imaging the subsurface of the Earth based on seismic waves produced by earthquakes or seismic activity.
Over recent weeks tomography has gained media attention after it was applied to one of the 7 Wonders of the World; the Pyramids of Egypt.
The news is very interesting in terms of human knowledge. An international team of scientists has used the flow of muons (elementary particles produced when cosmic rays collide with atoms in the Earth’s atmosphere) to scan the inside of the Great Pyramid of Giza, Egypt. Using this variant of the tomography technique a large chamber has been discovered that until then had been hidden behind the walls of the construction and which could reveal new mysteries hidden in the famous and ancient structure.
When we talk about climate change, sometimes referred to as global warming although it is not the same, we are talking about a significant and lasting change in weather patterns over long periods of time (ranging from decades to millions of years). These changes to the weather are not of a specific kind, but are caused by various factors.
Everyone has heard about acid rain but few know exactly what it is and what causes it. Acid rain is any type of precipitation with elevated levels of sulfuric acid and nitric acid. It is not only the liquid rain we are familiar with; it is also present in snow, fog, hail, dew, mist and suspended droplets that end up on the ground.
Skyscrapers have been getting taller and taller through the years. When New York City’s Empire State Building was built in 1931, it was the world’s tallest skyscraper in the world at 1,250 feet and remained at the top of this list until 1970, when another NYC building supplanted it, the World Trade Center’s North Tower. That reached 1,368 feet into the sky. However, the Empire State Building is now all the way down to 42nd on this set of rankings while the North Tower would have been 23rd were it still standing. Although asking, “Where are the tallest skyscrapers in the world in 2018?” would have previously resulted in an answer of “New York City,” that is no longer the case. In fact, none of the top five are even in the United States.
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