Save the Aral Sea

The Aral Sea (a saltwater lake in Central Asia) is shrinking. Compare the following photos, from 1989 and 2008.

This is an example of  irresponsible use of water. The rivers that feed the lake are used to irrigate extensive crops.
I took this video from youtube to show you the consequences that our actions may have on our planet.

A diamond is forever

Diamonds are the hardest  mineral in nature. They can cut almost everything. They are made of carbon atoms which have a special crystal shape.

                                                Diamond´s crystal structure


Each black ball represents a carbon atom..This crystallization requires incredible preassure and heat deep within Earth.That is why diamonds are so hard, contrary to pencil carbon made of the same stuff but with a different structure, as you can see in the following picture:

A rough diamond, in the left picture below. This is how diamonds look like when they are found in rocks. Experts must polish diamonds to make them into jewels, like the one in the right picture:

          
    Yes, a diamond is forever...