1 To delete one or multiple messages from a conversation or thread, click Messages on the left side of your homepage.The Messages can be found on the upper left side of the News Feed screen. 2  Select the conversation or thread you want to delete messages from. 3  Scroll up until you reach the message youâd like to delete.
Uses. Oxygen is of great importance in the chemical and the iron and steel industries. Its major use is in steel production, for example in the Bessemer process. The oxyacetylene torch is another important industrial application.Oxygen is utilized in medicine in the treatment of respiratory diseases and is mixed with other gases for respiration in submarines, high-flying aircraft, and spacecraft.ts major use is in steel production, for example in the Bessemer process. The oxyacetylene torch is another important industrial application. Oxygen is utilized in medicine in the treatment of respiratory diseases and is mixed with other gases for respiration in submarines, high-flying aircraft, and spacecraft.
This post will take you through some of the common uses of carbon in the world today. Uses of Carbon. 1  The major use of carbon is in the form of hydrocarbons, mainly methane gas and crude oil. 2  Crude oil is used to make gasoline and kerosene through distillation.