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).
When halogens combine or react with metals, they form ionic bonds. As a result of these reactions, these elements become anions, or negatively charged ions. Owing to their high reactivity, these are never found in a pure form in the nature.They must be extracted from their sources, using proper methods and techniques.hen halogens react with hydrogen, they form binary compounds known as hydrogen halides. These compounds (hydrogen halides) are extremely strong acids, which make them a unique brand of elemental family. When these compounds are converted to an aqueous state, they are known as hydrohalic acids.