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You are an Earth sign. What is Earth?

Earth is the third planet from the Sun and the fifth largest. If you completed the exercise at http://integratelearning.org/astrotask/ariesmath.htm, you measured the distance of all the planets from the Sun!

The Earth's orbit is 149,600,000 km (1.00 AU) from Sun.
The Earth'sdiameter is 12,756.3 km.
The Earth'smass is 5.972e24 kg
The Earth is 4.5 to 4.6 billion years old.

The Earth is divided into several layers. Each layer has different chemical and seismic properties. Following are the depths of each, shown in x10^24 kilograms.

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 crust cahnges a lot in thickness from one place to another. It is thinner under the oceans and thicker under the continents. The inner core and crust are solid; the outer core and mantle layers are plastic or semi-fluid.

Math Challenge

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Your Name:

!. How thick is the transition region in x10^24 kilograms?

2. How thick are the inner and outer core regions together in x10^24 kilograms?

3. Which is the thickest layer?

4. Which is the thinnest layer?

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Visit these sites for more information!

lab.ch/cgi-bin/uncgi/Earth/action?opt=-p - Satellite image of the Earth as it is seen at the moment! Click on each area to find more informatin. For more links, go to http://www.fourmilab.ch/earthview/vplanet.html

http://seds.lpl.arizona.edu/nineplanets/nineplanets/earth.html - For more information on how the Earth is formed.

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