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Geotimes
December 2005
Naomi Lubick |
Slushball Life Hundreds of millions of years ago, a carapace of ice may have periodically covered the entire planet. New research, however, indicates that microbes seem to have thrived in certain places that they should not have during that time, leading scientists to conclude that the snowball was more slushy than frozen solid.   |
Geotimes
April 2003
Dave Lawrence |
Microfossil lineages support sloshy snowball Earth Whether Earth's surface was completely frozen over during the glaciations about 900 to 540 million years ago (a hardball) or experienced open water near the equator (a slushball) is up for debate. Recent research now suggests that slushball conditions were more likely. |
Geotimes
November 2006
Carolyn Gramling |
Airing Out an Early Atmosphere Scientists have generally thought that oxygen was scarce in Earth's atmosphere until about 2.4 billion years ago. Now a study based on new evidence suggests that oxygen may actually have been around longer than previously thought. |
Chemistry World
March 15, 2009
Lewis Brindley |
Age of Photosynthesis Questioned Photosynthesis could have been flourishing on Earth nearly a billion years earlier than previously thought, according to a study by American geochemists. |
Chemistry World
April 9, 2009
Lewis Brindley |
'Nickel famine' caused ancient oxygen rise A crucial increase in atmospheric oxygen that occurred around 2.4 billion years ago could have been triggered by a shortage of nickel in the oceans, according to Canadian researchers. |
Geotimes
November 2007
Nicole Branan |
Volcanoes May Have Swallowed Early Earth's Oxygen New research suggests that early Earth did have oxygen during parts of the Archean (between 3.8 billion and 2.5 billion years ago), but volcanoes swallowed it up, thus preventing life from thriving. |
Chemistry World
April 16, 2009
Jon Cartwright |
Isolated microbes survive for millions of years Researchers in the US and the UK have found microbes in the Antarctic that appear to have survived in isolation, without sunlight or new supplies of nutrients, for more than a million years. |
Geotimes
February 2007
Sally Adee |
Escape From Snowball Earth Early Earth didn't do things half-way: It may or may not have ever been a solidly frozen "snowball" in the deep geological past, but it was never a half-frozen ball of slush, according to a new study. |
Chemistry World
November 10, 2010
Mike Brown |
Sulfur story unearths oxygen environment Earth's atmosphere could have supported complex life 400 million years earlier than thought, according to sulfur isotope signatures found in some of the oldest rocks on Earth. |
Geotimes
April 2005
Sara Pratt |
Space Dust and Snowball Earth Within the spiral arms of the Milky Way galaxy are thousands of giant clouds of dust. Some researchers now say that these clouds collide with Earth every 140 million years, possibly explaining the causes of two distinct periods of widespread glaciation in the planet's geologic past. |
Geotimes
April 2005 |
Geomedia Arctic Climate Change in Photos... Book review: Frozen Earth: The Once and Future Story of Ice Ages by Doug Macdougall... Mapping Sinkhole Risk in Maryland... |
Geotimes
December 2003
Sara Pratt |
Cool Cambrian triggers life A controversial hypothesis put forth by a team of German researchers says the Cambrian explosion -- the momentous increase in biodiversity 542 million years ago that spawned most modern animal groups -- was caused by life itself. |
Chemistry World
May 27, 2014
Robert Newton |
Oxygen: a four billion year history Donald Canfield delivers his explanations with a deft hand, bringing us the evidence for oxygen's history on the Earth's surface. |
HHMI Bulletin
Winter 2013
Nicole Kresge |
The Past, Present, and Future Earth What does the 4.6 billion year history of Earth tell us about our modern planet? About 150 Washington, D.C., area high school students and 15 teachers from around the United States learned the answers to these questions at the 2012 HHMI Holiday Lectures on Science. |
Science News
March 17, 2001 |
TimeLine: March 14, 1931 70 Years Ago in Science News: New Welded Pipe Line Carries Water to San Diego... Age of Earth Determined as Over 2,000,000,000 Years... Moon Lacks Oxygen, Its Light Proves... |
Chemistry World
February 13, 2014
Simon Poulton |
The Earth as a cradle for life This enjoyable book by Stacey and Hodgkinson takes a long-term view of Earth's development as a habitable planet, incorporating physical, chemical and biological processes on the early Earth, to the modern world. |
Chemistry World
May 13, 2014
Tim Wogan |
Chemistry calculations reveal Earth's inner core Theoretical calculations have confirmed that the Earth's core contains a significant proportion of oxygen. |
Geotimes
January 2004
Cynthia Martinez |
Earth Science Week in the Limelight The sixth annual Earth Science Week, held Oct. 12-18, promoted understanding and appreciation of the value of earth science research and its applications and relevance to our daily lives. |
