If someone estimates the likelihood of events based on the ease with which they retrieve them from memory, they presume such events are common. this is called the

Answer is availability heuristic.

Explanation:

Heuristic is explained or described as an approach or method of solving problems through application of practical methods, though may not be perfect, but at least will be useful at that particular moment.

Availability heuristic, as one of the types of heuristic , can be described as a situation where an example that first come to mind on an issue or event is use to evaluate or solve a problem, or make an immediate decision. This might not be accurate or perfect, but useful at the time.

Another type or example of heuristic is representativeness heuristic.

giant impact theory - the moon was formed from the collision between earth and another mars-sized body.

colliding planetesimals hypothesis - the moon was formed from the same cloud of material as earth.

capture hypothesis - the moon was locked into orbit by earths gravity as it was passing by it.

accretion hypothesis - the moon was formed from collisions and combining of planetesimals.

i think this is right, if not and you know better let me know.

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explanation: