Farm system boundaries: Discussion of system boundaries in Chapter 3 mainly relates to farms of this type. Briefly, boundaries of Type 2 farm systems (and of Types 1, 3 and 4) segregate them distinctly from the external world, but the boundaries between individual farms are relatively weak.
What is Chromium? Chromium is a steel-gray lustrous metal that is important as an additive in the manufacture of steel alloys (chrome steel, chrome-nickel steel, stainless steel) and greatly increases the durability and resistance of these metals; hence its use in metal prosthetic implants.
Chromium(III) oxide is the inorganic compound of the formula Cr 2 O 3.It is one of principal oxides of chromium and is used as a pigment. In nature, it occurs as the rare mineral eskolaite.hromium(III) oxide is amphoteric. Although insoluble in water, it dissolves in acid to produce hydrated chromium ions, [Cr(H 2 O) 6 ] 3+ which react with base to give salts of [Cr(OH) 6 ] 3â .