The reduction or elimination of pollution.

test entry for water definition. This would be the spot where
a third entry would be put. This is just a block of text to
confirm the multi context definitions are working.

CAS Number: 7440-65-5. A highly crystalline, dark gray metal.
Yttrium is largely used in its oxide form, yttria (YxO3), which
is used to make red phosphors for color television picture tubes.
It is also used in small amounts as a metal alloy. Chemical
formula = Y. Molecular weight = 88.906 g/mol.

CAS Number: 7440-67-7. A grayish-white, shiny metal that is used
in the manufacture of cast iron and steel, as well as the
production os surgical appliances and superconductive magnets.
The oxide form of Zirconium (zircon) has a high index of
refraction and is therefore used as a gem. Chemical formula = Zr.
Molecular weight = 91.22 g/mol.

CAS Number: 7782-49-2. A metallic gray solid used heavily in the
production of glass, pigments, rubber, metal alloys,
petrochemicals and photographic chemicals. Chemical formula = Se.
Molecular weight = 78.996 g/mol +/- 3 g.

CAS Number: 7440-32-6. A shiny, dark gray metal that is used
extensively in industrial applications and in steel and aluminum
alloys. Titanium is probably best known for its use in surgical
implants. It is also used for treatment of some skin disorders.
Chemical formula = Ti. Molecular weight = 47.90 g/mol.

CAS Number: 7440-66-6. A bluish, pale gray metal that is an
essential nutrient in mammals. Thin layers of zinc are used to
galvanize iron or steel, which protect the underlying metal from
rusting. Zinc is also used in brass, bronze and nickel alloys,
and can be found in solder, cosmetics and pigments. Chemical
formula = Zn. Molecular weight = 65.409 g/mol.

CAS Number: 7440-24-6. A silvery-white metal that rapidly turns
yellow when it oxidizes. It is used in fireworks, signal flares
and in tracer bullets. Also added to alloys of tin and lead to
add hardness and durability. Strontium usually occurs as a
mixture of four stable isotopes. 26 other less common, yet
unstable isotopes exist, the most harmful of which is 90Sr. 90Sr
is the product of nuclear fallout and can cause health problems.
Chemical formula = Sr. Molecular weight = 87.62 g/mol.

CAS Number: 7704-34-9. Tends to appear as a yellowish solid.
Pure sulfur has no odor, but traces of impurity may create a
rotten egg odor. Sulfur is used widely in the creation of other
chemicals and in industrial and manufacturing applications, and
is therefore rarely found in pure form. Most sulfur is used to
create sulfuric acid. Chemical formula = S. Molecular weight =
32.065 g/mol.

CAS Number: 7440-17-7. A soft, silvery-white, highly reactive
metal. It is used as a catalyst; and in photocells and vacuum-
and cathode-ray tubes. Chemical formula = Rb. Molecular weight =
85.4678 g/mol.