Cascades is a noun and a verb (third person singular conjugation of cascade).
It is part of the Cascades. More specifically, it is part of the Cascade Volcanic Arc.
No
Mount Mazama is part of the Cascade Mountain Range
Washington, Oregon, and the northernmost part of California.
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
what part of speech is beneath
adverb
The Rocky Mountains, Sierra Nevada, and Cascade Range are part of the Cordilleras.
Mount Saint Helens is part of the Cascade Volcanic Arc. This volcanic arc is included in the ring of fire. All Cascade Volcanoes in the Western United States are considered part of the Ring of Fire.
The part of speech for "explicit" is an adjective.