Assertion: ocean's surface | /r/HasProperty | same elevation
Facets:
value: above sea level
type: LOCATION
value: approximately
type: DEGREE
Source sentences:
text: As the surfaces of Lakes Superior, Huron, Michigan, and Erie are all approximately the same elevation above sea level, while Lake Ontario is significantly lower, and because the Niagara Escarpment precludes all natural navigation, the four upper lakes are commonly called the "upper great lakes".