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A Breathable Earth
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| Topic: Geology |
11/01/07 |
| Summary: Geologists have determined when Earth may have first supported an oxygen-rich atmosphere similar to that of today. The study provides clues about how life on Earth has evolved alongside our planet's changing climate. |
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Earth's Life-Giving Rocks
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| Topic: Geology |
10/02/07 |
| Summary: If minerals deep in the Earth's mantle were not able to store oxygen, there might not be life on our planet's surface. New research results provide insight into how the subsurface of our planet helps maintain the Earth's habitability. |
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A Volcanic Switch
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| Topic: Geology |
09/13/07 |
| Summary: A switch from predominantly undersea volcanoes to a mix of undersea and terrestrial ones may have helped to increase oxygen levels in the ancient Earth's atmosphere. This increase allowed for the evolution of complex oxygen-breathing organisms. |
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Different at the Core
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| Topic: Geology |
07/01/07 |
| Summary: Silicon isotopes from the Earth, meteorites and planetary material have shown that the Earth's core may have formed differently than that of Mars. Additionally, the data shows that atoms of silicon from the Earth and Moon were likely mixed in the early stages of their development. The research points to important clues about the history of the Earth's environment. |
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The Dreadful Hammers of Jules Verne
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| Topic: Geology |
06/07/07 |
| Summary: In the nineteenth century, the new science of geology was greatly affected by technological innovations. From Astrobiology Magazine, European Edition is an essay about how Jules Verne used his novels, such as "Journey to the Centre of the Earth," to explore the latest geological findings. |
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Building a Habitable Earth
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| Topic: Geology |
05/31/07 |
| Summary: To understand the origin of life we need to know about the conditions on the early Earth, but the rock record for the first 700 million years of Earth history is gone. From Astrobiology Magazine, European Edition is a story about techniques scientists are using to peer farther back in time. |
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Life's Slimy Beginnings
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| Topic: Geology |
05/17/07 |
| Summary: From Astrobiology Magazine, European Edition is a podcast interview with Frances Westall of the Centre de Biophysique Moléculaire in France. She discusses her search for traces of life in the Earth´s most ancient rocks, and explains how fossilized microbial mats provide information about life´s slimy beginnings. |
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Earth's Early Quakes
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| Topic: Geology |
03/28/07 |
| Summary: The oldest preserved pieces of Earth's crust have provided evidence of active plate tectonics as early as 3.8 billion years ago. The rocks also yield information about the historical chemical composition of the oceans, providing a better understanding of how Earth's oceans may have affected the evolution of life. |
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Reading History in Rocks
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| Topic: Geology |
03/15/07 |
| Summary: Scientists are refining a technique to pin down the dates of events in the lives of rocks, including the collisions of continents or a rock's journey through the crust of the Earth. |
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Water World
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| Topic: Geology |
02/15/07 |
| Summary: Seismologists have created a new 3-D model that reveals the existence of an underground water reservoir deep in the Earth's mantle. The research could have implications in understanding our planet's global environment. |
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