Differentiate: Flat Universe and Closed Universe

Differences between Flat Universe and Closed Universe are as follows:

Flat Universe	Closed Universe
A flat universe is one where the total density of matter is exactly equal to the critical density, leading to a balance between expansion and gravitational pull.	A closed universe is one where the total density of matter is greater than the critical density, causing the universe to eventually collapse.
A flat universe has a geometry that is flat, like a two-dimensional plane.	A closed universe has a spherical shape, similar to the surface of a sphere.
A flat universe has a density that is exactly equal to the critical density.	A closed universe has a density that exceeds the critical density.
In a flat universe, the universe will expand forever but at a rate that slows down over time, approaching but never quite reaching zero.	In a closed universe, the universe will eventually stop expanding and start contracting, leading to a "Big Crunch."