Assertion: diatom's use | /r/MadeOf | raft
Facets:
value: in california
type: LOCATION
value: in shallow
type: LOCATION
Source sentences:
text: In California, use has been made of rafts anchored to float about 13 yd (12 m) below the surface, in shallow, less than 328-ft (100-m) deep water, to grow the highly productive, giant kelp Macrocystis as an industrial feedstock.