The Dust Bowl, also known as the Dirty Thirties, was a period of severe dust storms that greatly damaged the ecology and agriculture of the US and Canadian prairies during the 1930s; severe drought and a failure to apply dryland farming methods to prevent wind erosion (the Aeolian processes) caused the phenomenon.
All metals are placed at the left side of the periodic table. Around 75% of elements are metallic in nature and belong to s, d and f-blocks. The non-metals and metalloids are placed in p-block with few metals. The elements of f-block are also called as Lanthanides and Actinides.These names come from the Lanthanum and Actium after which, both series of f-block are started.ses of Lanthanides and Actinides. 1  They donât find any use in their pure state. 2  They are used in the production of alloys of steel to improve the strength and workability of steel. 3  A well known alloy is mischmetal which is used in making magnesium based alloy (Mg mixed with 3% of mischmetal).
There are 17 elements that are considered to be rare earth elementsâ15 elements in the lanthanide series and two additional elements that share similar chemical properties.They are listed below in order of atomic number (Z): Scandium or Sc (21). Scandium, a silvery-white metal, is a non-lanthanide rare earth.his silver-white metal is one of the most reactive rare earth elements. It is used to make special optical glasses, including infrared absorbing glass, camera and telescope lenses, and can also be used to make steel more malleable. Other applications for lanthanum include wastewater treatment and petroleum refining.