SUMMARY: B-15A is a giant iceberg off the coast of Antarctica, and it's now on a collision course with a floating pier of ice called the Drygalski ice tongue. Satellite photos showed B-15A rushing towards the tongue, but then it slowed down in the last couple of days. Scientists think that there's a shallow seabed underneath the Drygalski ice tongue that has protected it from these kinds of collisions for so long - it's been there for at least 4000 years. B-15A is 120 km (75 miles) long, and contains about 2000 square km (772 sq miles), so it just have the momentum to do the trick.

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