Assertion: desertification | /r/HasProperty | historic phenomenon
Facets:
Source sentences:
text: Then, further down, under Prehistoric Patterns, there are the following sentences, "Desertification is a historic phenomenon; the world's great deserts were formed by natural processes interacting over long intervals of time.
text: Desertification is a historic phenomenon; the world's great deserts were formed by natural processes interacting over long intervals of time.