High explosives are substances that detonate with a very high rate of speed and release large amounts of energy. AMATOL is a mixture of TNT and ammonium nitrate, and is used in military and industrial applications. GELIGNITE is a type of explosive made from nitroglycerin, nitrocellulose, and a base material such as wood pulp or sawdust. It is used in mining and demolition. TNT (trinitrotoluene) is a yellow crystalline solid that is used in military explosives, fireworks, and propellants. All three of these substances are considered to be high explosives due to their high rate of detonation and the large amount of energy they release.