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They are called implied lines.
Called both Elevation Lines or Contour Lines
The different types of lines are horizontal, vertical, diagonal, and curvy. However, crosshatching can be used to create shadow. Drawings that depict movement but drawn with lines are called gesture drawings, and lines used to follow the edges of forms are called contour drawings.
Elevation contour lines.
Those lines representing elevation on a map are called contour lines. The difference in elevation between two of these lines is called the contour interval. Different maps use different contour intervals based on the scale of the map, or in other words, the size of the contour interval is based on how zoomed in and detailed the map is. Sometimes a map will have darker and thicker contour intervals. This is called the Index Contour Interval. Index contour intervals appear less frequently and represent a larger elevation change. It helps you figure out the amount of a large elevation difference faster because usually they are multiples of 100 or 1000, making them easier to add up.
a piece with 2 or more melodic lines
polyphonic
2 or more!
Polyphonic.
polyphonic texture
Simultaneous performance of two or more melodic lines of relatively equal interest produces the texture called polyphonic, meaning having many sounds. In polyphony several melodic lines compete for attention. The technique of combining several melodic lines into a meaningful whole is called counterpoint or contracanto.
In music, a piece which has interweaving melodic lines (lots of tunes weaving in and around each other) is said to show polyphony, or be polyphonic. Essentially, polyphonic is just another word for counterpoint.
Having a multiplicity of sounds., Characterized by polyphony; as, Assyrian polyphonic characters., Consisting of several tone series, or melodic parts, progressing simultaneously according to the laws of counterpoint; contrapuntal; as, a polyphonic composition; -- opposed to homophonic, or monodic.
Polyphonic - the weaving together of many ("poly") sounds. The line - voice - containing the chant is called the cantus firmus. The other voices can be derived from the chant or independently composed.
counterpoint.
FALSE
* Earliest polyphony called organum * Combining 2 (or more) melodic lines, or adding one (or more) new melodic lines to an existing chant