denser material on top of less dense material
lead, copper is a metal therefore it is harder
Because wulfenite is an ore of lead, any product containing lead, such as car batteries, solders, and plumbing, could contain material from wulfenite.
It has no color; it's a whitish material, looking something like table salt.
An increase in the kinetic energy of the molecules that a materiel is formed from. This can lead to a softening of the material or if enough energy is supplied the melting of the material. It can also cause chemical reactions which may alter the material. Both these processes occur in metamorphic rocks.
Lead is classified as a metal. it has luster, it has high density, it has a low melting point (compared to other metals), it is toxic, it is hard, it is strong (but not a good building material) and is a dull gray in color.
A lead screw is used to transfer circular motion into linear motion as the lead screw engages with a nut
lead is made out of anything but lead itself.
Lead
is a screw designed to translate turning motion into linear motion.
Graphite is the material that pencil "lead" is made from, but lead in it's strictest sense refers to the element itself (Pb on the periodic table).
== == The roof material is lead.
No, this material doesn't exist.
Lead is heavy.
The sum of different movement can lead to the motion. Motion supposes a change of place, From A to B. With other words : To go from A to B is a motion necessary. But different movements don't necessary lead to a motion.
because Lead is a very hard material
lead, copper is a metal therefore it is harder
Probably an observation of nature.