Assertion: aluminum | /r/HasProperty | difficult
Facets:
value: compared to most other metals
type: OTHER
value: extremely
type: DEGREE
Source sentences:
text: Aluminum is difficult to ignite yet has a high energy density.
text: Compared to most other metals, aluminum is extremely difficult to extract from its ore, called bauxite.
text: Stainless is relatively easy to weld, while Aluminum can be difficult.