An incomplete combustion give off black carbon particles.
Coal.
Yes, decomposition can release carbon dioxide, especially when organic matter breaks down in the presence of oxygen. Microorganisms responsible for decomposition consume organic materials and produce carbon dioxide as a byproduct of respiration.
Plants are used for many things, including oxygen, food, medicine, and clothing. Shelter, oil, gas, wood, building materials, and water are also things that plants give the world.
1. Carbon black 2. Vitreous graphite 3. Soot 4. Coals
A metal and carbon combination can appear shiny and metallic, with a color that can range from silver to gray or black depending on the specific metal and carbon content. The presence of carbon can also give the material added strength and hardness.
Black metals are typically composed of iron and carbon, with small amounts of other elements such as manganese, silicon, and sulfur. These elements give black metals their characteristic dark color and strength.
Copper Carbonate when heated decomposes to give copper oxide and carbon dioxide.
Radiometric dating is a technique that detects the presence and abundance of radioactive isotopes and is used to give approximate ages of materials. One common form is carbon dating.
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Monkeys give off carbon dioxide when they exhale - the same as humans do!
Many polymers burn with black fumes. Their molecules are very rich in carbon, and it's very difficult to give them enough oxygen to convert this to carbon dioxide, so small pieces of solid carbon (soot) are formed. These are so tiny they form a smoke. There will be lots of other chemicals in the smoke too, and it's best avoided.
The first load of water that passes through an activated carbon filter may contain some carbon dust (which will give it a tint of black). You are normally advised to flush the filter through once or twice and discard these first flushings. You will find that after this the water comes through clear. I am sure the carbon will not harm you but just to be safe discard the tinted water.