These are heptatonic (seven note) scales that traverse the octave in the following pattern of steps with respect to the chromatic scale. But these scales are of multiple types:
Natural Minor: 2 - 1 - 2 - 2 - 1 - 2 - 2
Harmonic Minor: 2 - 1 - 2 - 2 - 1 - 3 - 1
Ascending Melodic Minor: 2 - 1 - 2 - 2 - 2 - 2 - 1
Descending Melodic Minor: 2 - 2 - 1 - 2 - 2 - 1 - 2
Harmonic Minor: 2 - 1 - 2 - 2 - 1 - 3 - 1
Ascending Melodic Minor: 2 - 1 - 2 - 2 - 2 - 2 - 1
Descending Melodic Minor: 2 - 2 - 1 - 2 - 2 - 1 - 2
Explaining the first series (the rest are alike in meaning):
The above series indicate that after playing the tonic note, after which the major scale will be named, we play the second note, which is 2 semitones away from it. The third note of the scale is 1 semitone away from the second note, and so on and so forth. For a better explanation of the step jumps, view the post on major scales.
N.B.: Unless otherwise specified, a minor scale refers to the natural minor scale.
http://basicmusictheory.blogspot.com/2009/09/minor-scales-in-music-theory.html
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