Speed bumps under Thwaites Glacier could help slow its flow to the sea
A seismic survey reveals its icy underbelly may be snagging on tall rises in underlying land
![A photo of the vast and rugged surface of Thwaites Glacier, from above.](jpg/121823_no_thwaites_featb14e.jpg)
Antarctica’s Thwaites Glacier (pictured) is melting and currently contributing about 4 percent of global sea level rise.
Ted Scambos/University of Colorado