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).
a family of 14 chemical elements, with atomic numbers from 58 to 71, that follow lanthanum in the sixth period of the Mendeleev periodic system (see Table 1). The lanthanides and the elements scandium, yttrium, and lanthanum, which are similar to them, make up the rare earths. This name stems from the fact that the elements are rarely encountered and form refractory oxides that are insoluble in water and were known in the ancient terminology as earths.