sentence: All gliders use an aerofoil to slow their rate of descent.
sentences_before: Gliding' is when an object or animal goes through the air without active flight.
sentences_after: Glider planes have wings, and gliding animals have membranes which they stretch out. By using rising air they can prolong their stay in the air. The word 'soaring' describes this, and is also used for the sport of gliding.
concept_name: glider
headings: Gliding
categories: Aircraft Animals