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unsolved mysteries

A large “dent” in Earth’s geoid in the Indian Ocean indicates that less mass is concentrated here than is typical.
Posted inScience Updates

Seismologists Search for the Indian Ocean’s “Missing Mass”

by L. S. Ningthoujam, S. S. Negi and D. K. Pandey 18 April 201928 October 2021

An Indian scientific team set out to sea last year to find clues to the source of an unusually weak gravitational potential in the middle of the Indian Ocean.

A flooded neighborhood in San Diego, California.
Posted inResearch Spotlights

If Precipitation Extremes Are Increasing, Why Aren’t Floods?

by Terri Cook 17 April 201915 February 2023

Improving our understanding of the relationship between changes in precipitation and flooding due to rising temperature is a new grand challenge for the scientific community, argue the authors of a recent commentary.

A tornado touches down near Elie, Manitoba, Canada, in June 2007
Posted inNews

Before Canadian Scientists Can Study Tornadoes, They Have to Find Them

by R. Kaufman 22 March 201925 July 2022

A yearlong project aims to find more than 150 “missing” tornadoes thought to hit Canada each year.

Seismic tomography imaging shows a portion of a “blob” that sits at the base of the mantle below Africa.
Posted inFeatures

The Unsolved Mystery of the Earth Blobs

Jenessa Duncombe, Staff Writer by Jenessa Duncombe 27 February 201927 January 2023

Researchers peering into Earth’s interior found two continent-sized structures that upend our picture of the mantle. What could their existence mean for us back on Earth’s surface?

The view near McMurdo Station, Antarctica
Posted inResearch Spotlights

Observations Show Gravity Waves Above Antarctica Dance in Winter

by Terri Cook 5 February 20198 March 2022

Year-round observations show gravity waves above Antarctica exhibit seasonal patterns that peak in winter, which could help researchers trace the source of this mysterious phenomenon.

Stalagmites in a cave in Budapest, Hungary
Posted inNews

The Akkadian Empire—Felled by Dust?

Katherine Kornei, Science Writer by Katherine Kornei 31 January 201930 March 2023

Chemical measurements of a stalagmite from a cave in Iran reveal a large uptick in dust activity in northern Mesopotamia roughly 4,200 years ago, coincident with the decline of the Akkadian Empire.

Posted inEditors' Vox

Peering into Pores: What Happens When Water Meets Soil?

by C. Zhang and N. Lu 28 January 20193 December 2021

New research sheds light on the long-standing puzzle of how and why soil water density differs from free water density.

Slope streaks on Mars
Posted inEditors' Vox

Revisiting Enigmatic Martian Slope Streaks

by A. Bhardwaj, L. Sam, F. J. Martín‐Torres and M-P. Zorzano 15 January 201921 June 2023

Slope streaks of different sizes and shapes are a common feature on the surface of Mars, but scientists disagree about the mechanisms for their formation and development.

Arctic cyclone
Posted inNews

How Arctic Cyclones Change the Sea Ice

by R. Pérez Ortega 14 January 20199 August 2022

Whirlwinds disrupt the sea ice in the Arctic Ocean. Scientists are now beginning to understand how.

Pyrenees in Catalonia Spain
Posted inNews

Microbes Rain Down from Above, to the Tune of the Seasons

Jenessa Duncombe, Staff Writer by Jenessa Duncombe 8 January 201923 March 2023

Every time snow or rain falls, it brings with it microbes from high in the atmosphere. Could those microbes have a seasonal signal, just like the plants on the land below?

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Features from AGU Publications

Research Spotlights

More Bubbles Means More Variation in Ocean Carbon Storage

8 July 20258 July 2025
Editors' Highlights

Scientists Face Limitations Accessing Seafloor Information

9 July 20258 July 2025
Editors' Vox

Water Tracks: The Veins of Thawing Landscapes

25 June 202525 June 2025
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