Alexandria, Va. -- Earth's abundant silicate minerals are degraded over time by exposure to water, chemical dissolution, and physical and chemical weathering by tree roots and even insects such as ants and termites. Such weathering plays a significant role in decreasing carbon dioxide in the atmosphere, as carbon dioxide is consumed in chemical weathering reactions and the resultant carbonate becomes sequestered in the form of limestone and dolomite.
To study the effects of weathering over time, researchers buried basalt sand at multiple test sites and dug up the samples every five years for 25 years to measure the degradation. What they found shocked them: Ants broke down the minerals 50 to 300 times faster than controls. What the ants are doing with the stone and whether the tiny titans' weathering prowess can be harnessed to draw down carbon dioxide levels remains to be seen. Read more in the November issue of EARTH magazine: http://bit.
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The American Geosciences Institute is a nonprofit federation of 49 geoscientific and professional associations that represents more than 250,000 geologists, geophysicists and other earth scientists. Founded in 1948, AGI provides information services to geoscientists, serves as a voice of shared interests in the profession, plays a major role in strengthening geoscience education, and strives to increase public awareness of the vital role the geosciences play in society's use of resources, resiliency to natural hazards, and interaction with the environment.