News / Science & Technology

Study: Dust from Sahara Helped Form Bahama Islands

FILE - The Bahama Banks are submerged carbonate platforms that make up much of the Bahama Archipelago (NASA).
FILE - The Bahama Banks are submerged carbonate platforms that make up much of the Bahama Archipelago (NASA).
VOA News

What does the Sahara Desert have in common with a Caribbean island? Quite a lot, say researchers from the University of Miami.

Their study shows that the iron-rich dust from the vast African desert, carried 8,000 kilometers through the atmosphere across the Atlantic, nourished the specialized bacteria that produced the calcium carbonate to build up the Bahama islands over the last 100 million years.

Led by marine geologist Peter Swart, the scientists found high concentrations of two trace elements characteristic of Sahara's sand in samples of the sea floor along the Great Bahama Bank.

The sediment there was created by cyanobacteria, which, Swart says, "need 10 times more iron than other photosynthesizers because they fix atmospheric nitrogen."

That process produced the calcium carbonate that now surrounds the Bahama island chain.

Their research appears in the journal Geology.

You May Like

After Kenyatta Setback, ICC Struggles to Move Ahead

Collapse of the case against Kenya's president, other setbacks are fueling a debate about International Criminal Court's effectiveness and relevancy More

Video Conservationists Use Science to Preserve Rare Species of Rhino

With just five northern white rhinos left in the world, caretakers hope reproductive science may be able to preserve the gene pool More

Video Opening Trade With Cuba Bittersweet for Some

Long-time Cuban exiles in Miami say news is double-edged for those who had to leave everything behind More

This forum has been closed.
Comments
     
There are no comments in this forum. Be first and add one

Featured Videos

Your JavaScript is turned off or you have an old version of Adobe's Flash Player. Get the latest Flash player.
Islamic State Emergence Transforms Syria and Iraq in 2014i
X
December 23, 2014 7:28 PM
The emergence of the Islamic State in Iraq and Syria as a potent force in early 2014 changed the dynamics of the region. Their brutal methods - including executions and forced slavery - horrified the international community, drawing Western forces into the conflict. It also splintered the war in Syria, where more than 200,000 Syrians have died in the conflict. VOA’s Henry Ridgwell looks back at a deadly year in the region -- and what 2015 may hold.
Video

Video Islamic State Emergence Transforms Syria and Iraq in 2014

The emergence of the Islamic State in Iraq and Syria as a potent force in early 2014 changed the dynamics of the region. Their brutal methods - including executions and forced slavery - horrified the international community, drawing Western forces into the conflict. It also splintered the war in Syria, where more than 200,000 Syrians have died in the conflict. VOA’s Henry Ridgwell looks back at a deadly year in the region -- and what 2015 may hold.
Video

Video Massive Study Provides Best Look at Greenland Ice Loss Yet

The Greenland ice sheet is melting faster than predicted, according to a new study released in the Proceedings of the National Academic of Sciences that combines NASA satellite data and aerial missions. As VOA’s Rosanne Skirble reports, the finding means coastal communities worldwide could be at greater risk, sooner, from the impact of rising seas.
Video

Video US Marines, Toys for Tots Bring Christmas Joy

Christmas is a time for giving in the United States, especially to young children who look forward to getting presents. But some families don't have money to buy gifts. For nearly 70 years, a U.S. Marines-sponsored program has donated toys and distributed them to underprivileged children during the holiday season. VOA's Deborah Block tells us about the annual Toys for Tots program.
Video

Video France Rocked by Attacks as Fear of ISIS-Inspired Terror Grows

Eleven people were injured, two seriously, when a man drove his car into crowds of pedestrians Sunday night in the French city of Dijon, shouting ‘God is Great’ in Arabic. It’s the latest in a series of apparent ‘lone-wolf’ terror attacks in the West. Henry Ridgwell looks at the growing threat of attacks, which security experts say are likely inspired by the so-called "Islamic State" terror group.
Video

Video Russian Moves Provide New Mission for NATO

Russia’s more aggressive military posture in Europe during the past year has pushed NATO to take new steps to strengthen its defenses, providing it, analysts say, with a much-needed new mission. VOA’s Al Pessin reports from London.
Video

Video Jane Monheit Christmas Special

Chanteuse Jane Monheit sings the holiday classic “Have Yourself a Merry Little Christmas,” and explains why it’s her favorite song of the season.
Video

Video Ugandan Doctors Aid Victims of Sudan's Civil War

In Sudan's state of South Kordofan, the number of amputees as result of civil war is in the thousands, but few have access to sufficient medical help. Adam Bailes recently visited the area and says a small team of Ugandan doctors has been providing remote help, producing new prosthetic limbs for those in need.
Video

Video US Business Groups Press for Greater Access to Cuba

President Barack Obama's decision to do all he can to ease restrictions on U.S. trade, travel and financial activities with Cuba has drawn criticism from some conservatives and Republicans. People who bring tourists to the island and farmers who want to sell more food to Cuba, however, think they can do a lot more business with Cuba. VOA's Jim Randle reports.

Circumventing Censorship

An Internet Primer for Healthy Web Habits

As surveillance and censoring technologies advance, so, too, do new tools for your computer or mobile device that help protect your privacy and break through Internet censorship.
More

All About America

AppleAndroid