Iceberg: A23a calved from the Filchner–Ronne Ice

Iceberg A23a calved from the Filchner–Ronne Ice Shelf (on the northwestern side of Antarctica) in 1986 and had been stuck in the Weddell Sea off the coast of West Antarctica until it started moving again in 2020. When it calved, the iceberg was one of the largest icebergs in the world until it was temporarily surpassed in size by iceberg A76 (which had an area of 1,670 square miles when it calved from the Filchner–Ronne Ice Shelf in 2021, but has since split into three fragments). NASA's iceberg data includes current and historical measurements useful for mapping icebergs, glaciers that calve them, and their characteristics. Iceberg A23A was captured in this false-color corrected reflectance (Bands 7-2-1) image from the Moderate Resolution Imaging Spectroradiometer (MODIS) aboard the Aqua platform on March 4, 2025. The iceberg , the big blue object southwest of the island, has run aground near South Georgia Island in Antarctica. A23A is currently the world's biggest iceberg with an area of approximately 3,000 square kilometers, which is about the size of Rhode Island. Previous movement predictions suggested that ... Glacier Power: Teacher's Guide for Segment Review Questions Find answers to segment review questions included in Glacier Power chapters.