subclass_of freeline skates
Inline ___MASK97___ is a sport practiced widely internationally . Inline skates typically have 2 to 5 polyurethane wheels , arranged in a ___MASK65___ line , although 5 wheel designs are no longer manufactured . The in - line design allows for greater speed than roller skates and better maneuverability . The in - line wheels are coupled with boots designed for ___MASK97___ over and around various obstacles . Inline - ___MASK97___ is practiced and performed using inline skates designed for race tracks , skate parks , Urban areas , and off - road . An ___MASK52___ ( the ___MASK3___ of classical antiquity ) is a body of saline water that composes much of a planet ' s hydrosphere . On Earth , an ___MASK52___ is one of the major conventional divisions of the World Ocean , which covers almost 71 % of its surface . These are , in descending order by area , the Pacific , Atlantic , Indian , Southern ( Antarctic ), and Arctic Oceans . The word " ___MASK3___ " is often used interchangeably with " ___MASK52___ " in American English but , strictly speaking , a ___MASK3___ is a body of saline water ( generally a division of the world ___MASK52___ ) partly or fully enclosed by land . A tidal bore , often simply given as bore in context , is a tidal ___MASK12___ in which the leading edge of the incoming tide forms a wave ( or waves ) of ___MASK40___ that travels up a ___MASK14___ or narrow ___MASK34___ against the direction of the ___MASK14___ or ___MASK34___ ' s current . In ___MASK82___ , a standing wave  also known as a stationary wave  is a wave in a medium in which each point on the axis of the wave has an associated constant amplitude . The locations at which the amplitude is minimum are called nodes , and the locations where the amplitude is maximum are called antinodes . A skateboard is a ___MASK39___ of ___MASK70___ used primarily for the activity of skateboarding . It usually consists of a specially designed maplewood board combined with a polyurethane coating used for making smoother slides and stronger durability . Most skateboards are made with 7 plies of this wood . Snowboarding is a recreational ___MASK1___ and Olympic and Paralympic ___MASK64___ that involves descending a ___MASK41___ - covered slope while standing on a snowboard attached to a rider ' s feet . Inline skates are a ___MASK39___ of ___MASK20___ skate used for inline skating . Unlike quad skates , which have two front and two rear wheels , inline skates typically have two to five wheels arranged in a ___MASK65___ line . Some , especially those for recreation , have a rubber " stop " or " brake " block attached to rear of the frame . A ___MASK73___ pool is a ___MASK6___ in which there are artificially generated , reasonably large waves , similar to those of the ocean . Wave pools are often a major feature of ___MASK40___ parks . Siam Park City ___MASK40___ Park in Thailand is home to the world ' s largest ___MASK73___ pool certified by Guinness World Records , and Siam Park ( Tenerife ) in Spain is home to the biggest man made waves ( about 3 meters ( 9 . 8 ft )) in the world . Skateboarding is an ___MASK69___ sport which involves riding and performing tricks using a skateboard . Skateboarding can also be considered a recreational activity , an ___MASK78___ form , a job , or a method of transportation . Skateboarding has been shaped and influenced by many skateboarders throughout the years . A 2009 ___MASK77___ found that the skateboarding market is worth an estimated $ 4 . 8 billion in annual revenue with 11 . 08 million active skateboarders in the world . In 2016 , it was announced that skateboarding will be represented at the 2020 ___MASK45___ in Tokyo , Japan . Surfing is a ___MASK100___ ___MASK40___ sport in which the wave rider , referred to as a surfer , rides on the forward or deep face of a moving wave , which is usually carrying the surfer towards the shore . Waves suitable for surfing are primarily found in the ocean , but can also be found in lakes or in rivers in the form of a standing wave or tidal bore . However , surfers can also utilize artificial waves such as those from boat wakes and the waves created in artificial wave pools . Snowboards are boards that are usually the width of one ' s foot longways , with the ___MASK76___ to glide on ___MASK41___ . Snowboards are differentiated from monoskis by the stance of the user . In monoskiing , the user stands with feet inline with direction of travel ( facing tip of monoski / downhill ) ( parallel to long axis of board ), whereas in snowboarding , users stand with feet transverse ( more or less ) to the longitude of the board . Users of such equipment may be referred to as " snowboarder " s . " Commercial snowboards " generally require extra equipment such as bindings and special boots which help secure both feet of a snowboarder , who generally rides in an upright position . These types of boards are commonly used by people at ski hills or resorts for leisure , entertainment , and competitive purposes in the activity called snowboarding . Freeline skates are a pair of skates designed to give the feeling of skateboarding , snowboarding , surfing , and inline skates all in one . They consist of two separate metal or wooden plates with two wheels attached by a form of `` truck '' designed specifically for the skates . The technique used to skate with Freelines is unique to the skates , and is a challenging ___MASK73___ - like motion . The individual skates , when ridden together , produce ___MASK99___ , agility , and natural self - propulsion , allowing for uphill motion .