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The spread of coal use was gradual until the late 11th century when a timber shortage in north China produced a fast-paced expansion in coal mining and consumption. [12] In 1000 AD, Chinese mines were ahead of most mining advancements [clarification needed] in the world. [13] Coal mines in China faced similar problems to European ones.
Olympic pictogram for basketball. Basketball is a team sport in which two teams, most commonly of five players each, opposing one another on a rectangular court, compete with the primary objective of shooting a basketball (approximately 9.4 inches (24 cm) in diameter) through the defender's hoop (a basket 18 inches (46 cm) in diameter mounted 10 feet (3.048 m) high to a backboard at each end ...