دانلود رایگان پاورپوینت زغال سنگ (انگلیسی)

Coal
What is coal?
What is the coal used for?
HOW IS COAL MADE ???
Types of Coal
Where is coal?
Peat
Lignite
Sub-bituminous Coal
Bituminous Coal
Anthracite
Coke
Coal Key
Coal Mining
Mine Reclamation
Surface Mining Control and Reclamation Act, 1977
Cookie Mining

What is coal?
Most abundant fossil fuel in the world
Enough coal reserves to last 200 years
Dark sedimentary or metamorphic combustible rock made from swamp plants that died millions of years ago and were transformed by intense heat and pressure