What is the main difference between “freestyle” and “Greek-Roman” wrestling?
Answers
Greco-Roman wrestling and freestyle wresting both involve grappling with an opponent, but the two sports have their differences. Although it has an ancient-sounding name, Greco-Roman wrestling originated in France in the 19th century; the name comes from a desire to incorporate ancient values. Freestyle wrestling which derives from catch-as-catch-can wrestling, where you can use nearly any technique to pin your opponent's shoulders to the ground, became popular during the 19th century in the United States and Great Britain.
Greco-Roman has many of the same rules that Freestyle has, but you cannot utilize your (or your opponents) legs. You can “use” them, as it is impossible to stand without legs, but you cannot grab them, or kick with them to gain advantage. For instance if you are doing a reverse lift throw, you can pull the opponent up your legs, but if you use your legs to kick them up into position, you are in violation. You can push your feet into the mat to apply forward pressure when performing a gut wrench, but you cannot perform an ankle pick.
There are more technical ways to answer this, but in the most simple language, this should suffice.
Chemical weathering typically increases as temperatures rise and rain falls, which means rocks in hot and wet climates experience faster rates of chemical weathering than do rocks in cold, dry climates.
Physical weathering occurs more often in cold climates, because the different minerals within rocks expand and contract at different rates when they are heated and cooled. Repeated heating and cooling cycles eventually cause rocks to fracture. Desert and mountain climates experience a wide range of temperatures from low to high during a day and night, which accounts for the breakdown of rocks known as physical weathering.
Biological weathering occurs when living organisms break up rocks. Tree roots, for example, can fracture rocks in the same way they buckle pavement. Warm, humid climates are most favorable to life. Contrast the rich diversity of life in a rainforest, for example, with the scarcity of life in the dry Sahara or the frigid Antarctic. Consequently, rates of biological weathering are most rapid in warm humid climates like those in tropical regions.