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This insatiable appetite for energy will continue to chart the course of human civilization in the 5,000 years to come. In 1964, Russian astrophysicist Nicolai Kardashev theorized that a civilization's technical advancement directly correlates to the amount of energy its citizens can manipulate.As a result, it will also dictate what Earth will look like in A. Along these lines, he defined three classifications for advanced civilizations in the galaxy: Cosmologists use this Kardashev Scale to predict the technical advancement of future and alien civilizations.The facts we know about organisms that lived millions of years ago are found in fossils.Fossils are the remains left behind by an organism.Currently, modern humans don't even rank on the scale.

NASA image taken by Jeff Williams, Flight Engineer, from the International Space Station. Volcanic ash consists of powder-size to sand-size particles of igneous rock material that have been blown into the air by an erupting volcano.

There are three types of weathering which affect rock: physical, biological, and chemical.

Chemical weathering, also known as decomposition or decay, is the breakdown of rock by chemical mechanisms.

Human technology has advanced significantly over the past 5,000 years, and the Earth bears the scars to prove it.

We've altered the landscape, the climate and the biological diversity.

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