Which term does not describe a type of galaxy? irregular nebular spiral elliptical?

Nebular

Explanation:

Depending on the shape and appearance, there are three main types of galaxies. These are namely, irregular, spiral and elliptical galaxies. Nebula refers to any clouds that is made of dust and gases. Galaxies are one of the example of nebula. However, galaxies are not classified as "nebular galaxies".

answer

crater lake was formed when mount mazama produced a large eruption and collapsed to form a caldera, which then filled with water forming a lake.

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