Monthly Archives: March 2010

Isotopes in Medicine and Industry. A complete list.

Here’s just a sampling of radioactive materials…and the many ways they improve lives. Americium -241: Used in many smoke detectors for homes and business…to measure levels of toxic lead in dried paint samples…to ensure uniform thickness in rolling processes like … Continue reading

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The Rock Cycle

What goes around, comes around. Rocks are constantly being recycled. To  recycle means to take something old and change it into something new. So, some old rocks that have been around for more than four billion years are being changed … Continue reading

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Metamorphic Rocks

Metamorphic rocks are rocks that have changed. The word comes from the Greek “meta” and “morph” which means to change form.  Metamorphic rocks were originally igneous or sedimentary, but due to movement of the earth’s crust, were changed. If you squeeze … Continue reading

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Sedimentary Rocks

When mountains are first formed, they are tall and jagged like the Rockies. Over time, millions of years, mountains become old. When mountains get old, they are rounded and much lower. What happens in the meantime is that lots of … Continue reading

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Igneous Rocks

Towering nearly 400m above the tropical stillness of the Sunda Strait in Indonesia, one of the most terrifying volcanoes the world has ever known has begun to stir once more. 126 years since Krakatoa first showed signs of an imminent … Continue reading

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Rocks, an Introduction

Rocks are all the same, aren’t they? Well, not quite. Much of the Earth’s crust is covered by water, sand, soil and ice. If you dig deep enough, you will always hit rocks. Sometimes, of course, they are on the … Continue reading

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The Structure of our Planet

The Earth is a ball of diameter about 12,800km, which means  a journey of nearly 40,000km all the way round – quite a long way.It’s a little bit like an eggshell. The atmosphere is an incredibly thin protective layer of … Continue reading

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