Britannica Sources used in this answer

How can meteorite impacts form lake basins?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

lake Lake Ann in North Cascades National Park, Washington, U.S., viewed from the park's Maple Loop Trail. The North Cascades National Park is a large wilderness area that preserves majestic mountain scenery, snowfields, glaciers, and other unique natural features.

Meteorite impacts form lake basins by creating large, circular depressions in a planetary surface through a process known as hypervelocity impact. When a large asteroidal or cometary object strikes the surface, it releases an enormous amount of kinetic energy, vaporizing the meteorite and excavating a crater.1

The resulting depression can take two primary forms:
* Simple craters: These are parabolic, bowl-shaped depressions formed when excavation concludes.1
* Complex craters: Larger impacts undergo a modification stage where the initial cavity collapses, often resulting in a flat floor or a central peak.1

These impact-generated cavities can subsequently fill with water to form lakes. While meteorite craters are often dry, particularly in arid climates, some do contain lakes, such as Ungava Lake in Quebec. It is important to note that not all basins resembling meteorite craters are confirmed to be of impact origin, and many potential sites remain controversial. Additionally, craters formed by volcanic explosions are distinct from those created by meteorite impacts.23