Assertion: crust | /r/MadeOf | 20% silicon
Facets:
Source sentences:
text: The crust consists of 43% oxygen, 20% silicon, 19% magnesium, 10% iron, 3% calcium, 3% aluminum, and trace amounts of other elements, including chromium (0.42%), titanium (0.18%), manganese (0.12%), and smaller amounts of uranium, thorium, potassium, hydrogen, and other elements.