lead is not a man made substance. Infact lead is a poisonous element
lead is made out of anything but lead itself.
The lead in a pencil is actually made of a mixture of graphite and clay. Despite its name, it does not contain any actual lead. The proportions of graphite and clay determine the hardness of the lead.
Soder used to be made of a mixture of tin and lead. But when it was discovered that lead was poisonus, it changed to a mixture of mainly tin.
Lead chloride can be made by reacting hydrochloric acid with lead(II) nitrate or lead(II) oxide. This reaction forms lead chloride as a white precipitate. It is important to conduct this reaction in a well-ventilated area and handle lead compounds with care due to their toxic nature.
No, Uranium is naturally occurring. But all elements beyond uranium are man-made.
Mastering agriculture is what made early man settle down in one place and stay.
Bluebird have adapted to use man made boxes for nesting. Their ready acceptance of the man made home has lead to a very successful conservation effort.
Technetium. Element 43, no stable isotopes.
Lead is an element, it is not made of anything but lead. But if you are talking about pencil lead then pencil lead is made of graphite.
The lead in pencils are not made out of lead, as is common belief. Pencil lead is made out of graphite.
Lead pollution of their food sources, shooting and collisions with man made objects.
the lead in a lead pencil is made from clay and graphite
Man-made preservatives are made my man
everything that is man made is made by man hence the name doofus
Lead is a heavy metal that is naturally found in the Earth's crust. It is usually found in combination with other elements such as sulfur (galena) or oxygen (lead oxide). Lead can also be man-made and is commonly used in batteries, construction materials, and ammunition.
Lead.
Cereal has lead in it.