(February 2014) Allusion is a figure of speech, in which one refers covertly or indirectly to an object or circumstance from an external context. It is left to the audience to make the connection; where the connection is directly and explicitly stated (as opposed to indirectly implied) by the author, it is instead usually termed a reference.
Titanium metal connects well with bone, so it has found surgical applications such as in joint replacements (especially hip joints) and tooth implants. The largest use of titanium is in the form of titanium(IV) oxide. It is extensively used as a pigment in house paint, artistsâ paint, plastics, enamels and paper.
If you're looking for elements in the lanthanide family, a good place to start would be in the earth's crust. Elements found in the earth's crust are called rare earth metals, and lanthanide elements are good examples of these. For instance, one of these rare earth metals is called lanthanide praseodymium. It's found in the earth ore monazite and is shown below. Let's step back in time a moment.