Resident orcas’ appetite likely reason for decline of big Chinook salmon

Orca and Chinook

Killer whales prefer to eat only the biggest, juiciest Chinook salmon they can find. The larger the fish, the more energy a whale can get for its meal. Each year these top ocean predators consume more than 2.5 million adult Chinook salmon along the West Coast. Except for the endangered southern resident population in Washington, all other fish-eating orca populations that live along the coast, called “residents,” are growing in number.  

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Barrels of ancient Antarctic air aim to track history of rare gas

Law Dome drilling site

Ancient air samples from one of Antarctica’s snowiest ice core sites may add a new molecule to the record of changes to Earth’s atmosphere over the past century and a half, since the Industrial Revolution began burning fossil fuels on a massive scale. While carbon dioxide and methane are well known, researchers at the University of Washington and the University of Rochester are part of a team working to trace a much rarer gas, present at less than one in a trillion molecules. 

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Take a peak: 10 facts about the tallest mountain on Earth

students in Hawaii

When thinking of the “biggest” mountains on Earth, many people immediately think of Mount Everest or Denali, but some of the biggest mountains actually start below sea level and grow into islands. At over 33,000 feet, Mauna Kea in Hawaii reigns supreme as the biggest mountain on Earth as measured from base to top. Let’s explore the ways in which these mountains are different, both in how they are made and their geologic setting. 

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