1 Cropping an image means to select a rectangular region to use. 2  To crop an image: 3  Right click on the image file in the File Explorer, select Open With, Paint. 4  Right click on the Select item in the toolbar.  Depress the left mouse button at the upper left corner of the rectangular region you wish to select.
TNT is made by adding 3 NO 2 groups (from nitric acid) to toluene. At low temperatures, the mononitrotoluenes are made, and as the reaction temperature is increased the dinitro compounds are formed, until eventually TNT is formed. TNT is explosive for two reasons. First, it contains the elements carbon, oxygen and nitrogen, which means that when the material burns it produces highly stable substances (CO, CO 2 and N 2) with strong bonds, so releasing a great deal of energy.
BRAINSTORM|Points 3057|User: DNA is made of nucleotides which are composed of A. a phosphate group, a sugar group and a nitrogenous base. B. a sugar group, an amino acid group and a nitrogenous base. C. a phosphate group, a starch group and a nitrogenous base. D. a protein group, a sugar group and a nitrogenous base.