Assertion: moon's surface | /r/HasProperty | roughly 43% oxygen
Facets:
value: by weight
type: OTHER
Source sentences:
text: The lunar surface is roughly 43% oxygen, 20% silicon, 19% magnesium, 10% iron, 3% calcium, 3% aluminum, 0.42% chromium, 0.18% titanium and 0.12% manganese, by weight.