When exactly did oxygen first appear in Earth's atmosphere? Although many physical and chemical processes are thought to be responsible for that profound transformation, scientists have tried to answer at least part of that ...
Cell & Microbiology
May 6, 2010
0
0
(PhysOrg.com) -- New evidence gleaned by analyzing calcium embedded in Chinese limestone suggests that volcanoes, which spewed massive amounts of carbon dioxide into the atmosphere for a million years, caused the biggest ...
Earth Sciences
Apr 27, 2010
10
4
Four billion years ago, our then stripling sun radiated only 70 to 75 percent as much energy as it does today. Other things on Earth being equal, with so little energy reaching the planet's surface, all water on the planet ...
Earth Sciences
Apr 6, 2010
5
0
A geologist from the University of Leicester is part of a team that has uncovered an ancient water flea-like creature from 425 million years ago - only the third of its kind ever to be discovered in ancient rocks.
Archaeology
Mar 22, 2010
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1
(PhysOrg.com) -- Princeton University scientists have shown that, in ancient times, the Earth's magnetic field was structured like the two-pole model of today, suggesting that the methods geoscientists use to reconstruct ...
Earth Sciences
Oct 2, 2009
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1
When Planet Earth was just cooling down from its fiery creation, the sun was faint and young. So faint that it should not have been able to keep the oceans of earth from freezing. But fortunately for the creation of life, ...
Earth Sciences
Aug 18, 2009
7
0
(PhysOrg.com) -- The fossil record is known to be biased by the unevenness of geographical and stratigraphical sampling, and the lack of exposed rocks containing fossils. In a recent Perspective in Science [2 January 2009] ...
Earth Sciences
Jan 14, 2009
0
1
NASA is actively working to return surface samples from Mars in the next few years, which they hope will help us better understand whether ancient life once existed on the red planet's surface billions of years ago. But what ...
Astrobiology
May 27, 2024
1
30
The islands of South-East Asia record a long and dynamic human history of technological innovation, migration and conflict.
Archaeology
Aug 24, 2023
0
40
Paleontologists from Flinders University are using a micro-CT scanner and 3D printing to reconstruct a small dinosaur preserved as opal for more than 100 million years in white sandstone rocks.
Biotechnology
Aug 29, 2022
0
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