Megan Thompson-Munson, a geologist and climate scientist, has seen your drawings of icebergs and had enough. It’s time for a scientific reckoning.

“The iceberg's sharp angles and flat surface indicate that it probably recently calved from the ice shelf,” NASA tweeted, referring to the Larsen C ice shelf.

The loss of the iceberg also brings the shelf to a state not observed in the 150 years of tracking the glacier — and potentially much longer, Dyke said. The ice shelf bracing the glacier lost ...