Final answer:
Large, circular depressions greater than 1 km across are called calderas, created by the collapse of land after a volcanic eruption.
Step-by-step explanation:
The large, circular depressions with diameters greater than 1 km across are known as calderas. These geological formations can be found on both Earth and other planetary bodies, such as Venus. A caldera is typically formed by the collapse of land following a volcanic eruption, leaving a large, crater-like feature that can be several kilometers in diameter. An example of a caldera on Earth is the Crater Lake in Oregon. Calderas can be even larger on other planetary bodies, such as the 40 km wide caldera atop the Sif Mons volcano on Venus. These crater-like depressions should not be confused with impact craters formed by the collisions with celestial objects like meteorites, which usually create a distinct ejecta pattern around them.