Judo in Canada Canada there are six "kyū" grades for seniors (people 16 years of age or older), eleven "kyū" grades for juniors (people under the age of 16), and ten "dan" grades that are restricted to seniors. Both senior and junior students begin as white belts ("rokkyū") and progress with promotion through yellow, orange, green, and blue, to brown belt ("ikkyū"). Half-grades for juniors were introduced in 2010 and are represented by belts that combine the colours of the previous grade and the next grade (a white and yellow belt, for example, represents a half-grade between "rokkyū" and "gokyū", which the grading
Paired metamorphic belts of plate tectonics in the late 1960s, led to a better understanding of regional metamorphism and permitted the association between paired metamorphic belts and subduction zones. The asymmetric deformation of earth's lithosphere along subduction zones produces two distinct thermal environments. These two distinct thermal conditions are parallel to the trend of the subduction zone. Low temperature, high pressure conditions are generated in the areas along the oceanic trench, whereas high temperature, low pressure conditions are generated beneath the arc region. A positive thermal gradient is visualized, extending from the colder oceanic trench to the warmer arc region. The thermal and