It is called the crust, or the lithosphere, depending on the details. Crust is the chemical definition, lithosphere is the physical definition.
2007-02-21 10:29:14
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answer #1
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answered by QFL 24-7 6
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Tomographists have found that this planet is divided into six regions: the inner core, the outer core, the lower mantle, the upper mantle, the transition region, and the crust (oceanic and continental). Here is a brief synopsis of the depths of each layer (in kilometers):
0- 40 Crust
40- 400 Upper mantle
400- 650 Transition region
650-2700 Lower mantle
2700-2890 D'' layer
2890-5150 Outer core
5150-6378 Inner core
The outer most layer, the crust, is categorized into two parts, the Oceanic crust and the continental crust. The Oceanic crust is the smallest part of Earth, only 0.099% of its mass and reaching a small depth of 0-6 miles (0-10 kilometers). In the beginning of time, it was possible that this area did not exist for through frequent volcanic activity does only the crust form. Evidence of this is marked by the oceanic ridge system, which is a 25,000 mile (40,000-kilometer) array of many volcanoes which creates layer after layer of new crust at the rate of 17 km3 per year. The ocean floor is covered in basalt originating from volcanic activity and as a matter of fact, Iceland and Hawaii are two island systems that emerged from the accumulated basalt.
Continental crust: The second smallest area of the Earth is the Continental crust, making up only 0.374% of the Earth's mass and extending a short depth of 0 - 31 miles (0-50 kilometers). Looking at the percent by composition, the continental crust makes up only 0.554% of the mantle-crust mass. The layer is composed primarily of crystalline rocks made of low-density buoyant minerals dominated mostly by quartz (SiO2) and feldspars (metal-poor silicates). This is the outer part of the Earth composed essentially of crystalline rocks. The continental crust and the oceanic crust are also referred to as the lithosphere because of the cool and rocky conditions that exist in its chemical composition.
2007-02-25 02:52:47
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answer #2
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answered by Anonymous
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1. The Earth's outermost surface is called the crust. The crust is typically about 25 miles thick beneath continents, and about 6.5 miles thick beneath oceans. The crust is relatively light and brittle. Most earthquakes occur within the crust.
2. In geology, a crust is the outermost layer of a planet, part of its lithosphere. Planetary crusts are generally composed of a less dense material than its deeper layers. The crust of the Earth is composed mainly of basalt and granite. It is cooler and more rigid than the deeper layers of the mantle and core.
2007-02-21 10:33:42
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answer #3
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answered by N T 2
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IT IS THE PRESSURE ZONE ,KEEPING THE PRESSURE WITHIN HER,THE MOTHER EARTH THAT SUPPORTS ALL LIFE,THE EARTHS CRUST IS THE SHELL OF THE WORLD AND IS SOON TO CRACK INTO, TWO HALF'S ,ENDING THE WHOLE OF THE WHOLE COSMOS,IN CIRCLING AROUND A STAR IN CIRCLING WITHIN A CIRCLE.THAT IS WHY I AM HERE ,TO SAVE MY WORLD AND I SAVE IT ,THE PIPER NEVER FAILS ,BUT YOU ELDERS PAY THE PIPER,FOR THE DEVIL"S DUE TO STOP YOU
2007-02-21 11:07:41
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answer #4
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answered by Anonymous
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earth crust or lithospehere
2007-02-25 05:14:35
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answer #5
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answered by kapmakunat 2
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pressure zone????
its called the crust
2007-02-24 16:51:28
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answer #6
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answered by 22 4
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crust
2007-02-21 10:28:54
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answer #7
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answered by Mikey 2
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