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Worldworx Travel> Global Information> Earth Structure
Global Information: Earth Structure
The earth's structure is made up of a series of elements, evolved over a great period of time. Our modern day earth is the result of over 4.5 billion years worth of evolution. Over time, the earth's continents have been shaped by elements such as volcanic eruptions and earthquakes. Great areas of land have separated as plates have shifted and whole mountain ranges and seas have formed as a result of the earth's movement during its lifespan.

The islands of our great oceans have also been formed by volcanic activity and indeed as quickly as these landforms appear, they sink back into the depths of the seas. Inside the earth is an incredibly hot inner core composed of pure and solid iron. The outer core is made of liquid iron and nickel. The surface of the earth is known as the 'crust'. Rocks continually change their shape and form as they are eroded by winds and other natural elements. Examples of some of the rocks that make up the earth's surface include sandstone, basalt, limestone, granite, schist, gneiss and andesine.

The Himalayas were created between 10 and 20 million years ago when the old continent of Gondwanaland merged with Asia, raising the earth's elevations. The chain of the Hawaiian Islands was created by magma from volcanic activity in the Pacific Ocean over a period of millions of years.
 

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