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In the National Football League,use of both amphetamines and steroids by players was banned in 1971.
Cement
A binding material, often used in construction, made by grinding calcined limestone and clay to a fine powder which hardens when mixed with water.
Quarries
Open-pit mining operations where stone, limestone, marble, or other materials are excavated for building and decorative uses.
Mudcracks
Cracks in clay-rich soil or sediment that occur as it dries, typically indicating past water presence.
Bedding
The formation of parallel layers of sediment as they accumulate over time, indicating successive periods of deposition.
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