Category: Earth

A drop in CFC emissions puts the hole in the ozone layer back on track to closing

A reduction in illegal pollution from China is driving the decline, new data suggest

Good news for the ozone layer: After a recent spike in CFC-11 pollution, emissions of this ozone-destroying chemical are on the decline.

Fin whale songs can reveal hidden features of the ocean floor

The sounds can penetrate Earth’s crust as seismic waves, illuminating its structure

The fin whale’s call is among the loudest in the ocean: It can even penetrate into Earth’s crust, a new study finds. Echoes in whale songs recorded by seismic instruments on the ocean floor reveal that the sound waves pass through layers of sediment and underlying rock. These songs can help probe the structure of the crust when more conventional survey methods are not available, researchers report in the Feb. 12 Science.

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