Ice age cut massive channels under North Sea

Scientists have detailed the massive undersea channels formed by melting ice sheets at the end of the last Ice Age. Using 3D imaging, they revealed hundreds of channels under the North Sea, matching areas once covered by ice. These channels were carved by powerful meltwater rivers. Researchers used sonic equipment to map the sea floor, providing data to understand and predict the behavior of current ice sheets in Greenland and Antarctica.

What technology did researchers use to study the bedrock under the North Sea?

How does understanding the behavior of melting ice sheets help predict future changes in Greenland and Antarctica?