Earth’s Structure

Posted By: Margie Babon

 

 Earth's Structures

Earth has three main layers: the crust (on the outside), the core (at the center), and between these two, a thick intermediate layer, the mantle.

Most of our knowledge about the interior of the earth has come from information revealed by the study of earthquake wave.About 99 percent of the rock in Earth’s interior is hotter than 2,000 deg. Fahrenheit. The processes of radioactive decay generate heat in Earth’s interior faster than the current rate of human global energy consumption.

For a few million years, planet earth was a molten liquid or semi molten sphere.  The gravity concentrated near the center is denser and the materials near the surface are less dense. As earth solidified, it developed an internal structure of three main layers: a thin crust of relatively light rocks, a much deeper layer of denser rocks—the mantle and at the center—a heavy core, made of iron and nickel.

 

Earth as an egg

Earth as an Egg

The proportions of crust, mantle, and core that comprise Earth are similar to the proportions of shell, white and yolk in an egg.

 

What is Geothermal?

Geothermal- relating to heat generated in Earth’s interior by the decay of radioactive elements such as uranium and thorium.

 

What is the deepest artificial hole on Earth?

The deepest artificial hole that has been made in Earth’s crust accounts to 7.4 miles deep, called the Kola Superdeep Borehole located in Northwestern Russia, close to that country’s border with Norway. Drilling started in 1970, with the objective of establishing result of scientific drilling project of the Soviet Union on the Kola Peninsula. The project attempted to drill as deep as possible into the Earth’s crust. In 1989 reached 12,262 meteres (40,230 ft.)  and still the deepest artificial point on Earth.

For two decades, it was the longest borehole in the world until surpassed in 2008 by Al Shaheen oil well in Qatar with 12,289-meter-long (40,318 ft) and in 2011 by 12,345-meter-long (40,502. Ft) by Sakhalin oil well in the offshore of the Russian island.

 

The Kola Super Deep Hole expected to reach 13,500 m (44,300ft) by the end of 1990 and 15,000m (49,000 ft) by 1993. But due to higher-than expected temperatures 180 deg C (356 deg Fahrenheit), drilling deeper was unfeasible and the drilling was stopped in 1992.

 

Reference: Wikipedia, Bite-size Science

 Illustrations: Margie Babon

 

About 

margie-blog pic-final 21oct

Margie Babon was given a privilege to become a wildlife photographer in 2006 that let her choose to be a vegetarian for seven years now. Has background in film making as a producer and researcher on the plight of Agta-Dumagat documentary film Children of the Mountains that garnered the 2005 Mark Haslam Awardee  in Toronto, Canada. Sharing her passion in photography, drawing & creative writing  is a great opportunity to express her wisdom which is beyond academic teaching career for more than five years in College of Architecture and School of Fine Arts.

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