Assertion: lead | /r/AtLocation | the earth's crust
Facets:
value: naturally
type: MANNER
Source sentences:
text: Lead is a heavy, low melting, bluish-gray metal that occurs naturally in the Earth's crust.
text: Lead is a heavy, low melting, bluish-gray metal that occurs naturally in the Earth's crust.
text: Lead is a metal that occurs naturally in the earth's crust, but human activity — mining, burning fossil fuels and manufacturing — has caused it to become more widespread.
text: Lead occurs naturally in the earth's crust, where it combines with other elements such as oxygen and sulfur.
text: It occurs naturally in the earth's crust, and human activities such as burning fossil fuels, mining, and manufacturing have spread it throughout the environment, including our homes and workplaces.