Assertion: stratospheric ozone | /r/CapableOf | form in upper atmosphere
Facets:
value: naturally
type: MANNER
Source sentences:
text: Unlike stratospheric ozone, which forms naturally in the upper atmosphere and protects us from the sun's harmful ultraviolet rays, ground-level (or tropospheric) ozone is created through the interactions of man-made (and natural) emissions of volatile organic compounds and nitrogen oxides in the presence of heat and sunlight.