Assertion: glacier | /r/MadeOf | several materials
Facets:
value: given in units of kg m-3
type: OTHER
value: with different densities
type: OTHER
Source sentences:
text: Glaciers are made of several materials with different densities (given in units of kg m-3): snow that fell in the most recent winter (200-500 kg m-3), firn (snow from previous winters, 500-900 kg m-3) and ice (900 kg m-3).