Assertion: emerald | /r/MadeOf | oxygen
Facets:
Source sentences:
text: Emeralds are made from 4 elements, beryllium, aluminum, silicon, and oxygen that are found deep in the Earth's crust: These elements are found flowing in seams in this crust filled with hot water called hydrothermal veins.
text: Emeralds are made from 4 elements, beryllium, aluminum, silicon, and oxygen that are found deep in the Earth's crust: These elements are found flowing in seams in this crust filled with hot water called hydrothermal veins.