Earth Magazine - May 2018.pdf

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EARTH
WETLANDS REMEDIATE
NITROGEN POLLUTION
LA NIÑA TO BLAME
FOR WEST’S DRY WINTER
May 2018
www.earthmagazine.org
RECYCLING RAISES
LEAD LEVELS IN AFRICA
Oman’s Outstanding
Ophiolites, Canyons
and Dunes
The complete collection of Geotimes and
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FEATURES
EARTH
May 2018 | vol. 63 no. 5 | www.earthmagazine.org
22 | FROM FARM TO FILTER:
Restored Wetlands Remediate
Nitrogen Pollution
The early 20th-century invention of a
nitrogen-fixation process revolutionized
agriculture and made it possible to
feed the planet’s growing population.
But nitrogen runoff is polluting our
waterways and suffocating aquatic life.
Now, researchers looking for ways to
reverse that trend are turning farmland
into wetlands to filter nitrogen from
streams and rivers. | Nia
Hurst
22
28 | SLUMGULLION:
Colorado’s Natural “Lab” Offers Insights
Into Landslides Worldwide
In southwestern Colorado, a centuries-
old landslide (first identified as such
in 1883 by an infamous prospector
and purported cannibal) is offering
geologists an ideal laboratory to study
slow-moving slides. | Jane
Palmer
28
VOICES
38
38 | TRAVELS IN GEOLOGY:
Northern Oman: Stunning Canyons,
Towering Dunes and the World’s
Largest Ophiolite
The small, politically stable sultanate
of Oman hosts the world’s biggest and
most intact ophiolite — a rare slice of
oceanic crust emplaced on land — as
well as stunning canyons, turquoise
swimming holes, lush palm oases,
Bronze Age tombs, endangered sea
turtles and endless fields of sand
dunes. | Lon
Abbott and Terri Cook
64
GEOLOGIC COLUMN:
A WORLD WITHOUT MEASURE
The treaty establishing a global, uniform system of
measurement was signed on May 20, 1875. Today, we honor
that achievement by celebrating World Metrology Day on
May 20. | John
Copeland
ON THE COVER: Oman’s stunning sand dunes. Credit: Lon Abbott and Terri Cook
NEWS
10
DOUBLE-DIP LA NIÑA BLAMED FOR
COLORADO’S DRY WINTER
11
WORLD’S LONGEST UNDERWATER CAVE FOUND
IN MEXICO
12
WHATEVER HAPPENED TO THAGOMIZERS AND
OTHER TAIL WEAPONS?
17
ORIGINS OF PLANT
PHOTOSYNTHESIS ILLUMINATED
18
RISING WATERS SINK SEAFLOORS
19
LIDAR PRESERVES RECORD OF DESTROYED
THEROPOD TRACKS
13
13
UNPRECEDENTED
EXPLORATION OF
UNDERSEA VOLCANO
YIELDS SURPRISING
RESULTS
14
BATTERY RECYCLING
UNDERLIES ELEVATED
LEAD IN AFRICAN SOILS
15
HOT TROPICS DROVE
OUT ANCIENT REPTILES,
BUT THEY CAME BACK
16
RADIUM LEVELS
SUGGEST ARCTIC OCEAN
CHEMISTRY IS CHANGING
19
19
FLIGHTLESS DINO HAD BRIGHT, RAINBOW-
COLORED FEATHERS
20
20
HOW BORNEO GOT ITS ELEPHANTS
20
NEW MAP OF TITAN SHOWS MOON’S
HIDDEN SURFACE
21
ICE (RE)CAP
14
DEPARTMENTS
4
FROM THE EDITOR
6
PERSPECTIVES
52
DOWN TO EARTH: With National Park Service
Senior Paleontologist
Vincent Santucci
56
BENCHMARKS:
MAY 3, 2003:
New Hampshire’s Old Man
of the Mountain Falls
60
CLASSIFIEDS: Career Opportunities
48
GEOMEDIA: BOOKS: Solar
Eclipses Past, Present
and Future
50
WHERE ON EARTH?
51
CROSS-SECTION: A Puzzle
ON THE WEB AT
www.earthmagazine.org

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