Assertion: roller coaster | /r/MadeOf | steel
Facets:
Source sentences:
text: Most modern roller coasters are made of steel, although wooden coasters and hybrids are still being built.
text: The term used to describe a support structure on a roller coaster made of steel.
text: Most modern roller coasters are made of steel, although wooden coasters and hybrids are still being built.
text: Most modern roller coasters are made of steel, although wooden roller coasters are still being built along with hybrids of steel and wood.