Been observed in Viking

Jai alai is a Basque sport involving bouncing a ball off a walled-in space by accelerating it to high speeds with a hand-held wicker, commonly referred to as a cesta. It is a variation of Basque pelota. The term jai alai, coined by Serafin Baroja in 1875, is also often loosely applied to the fronton where matches take place. The game, whose name means \"merry festival\" in Basque, is called zesta-punta in the Basque Country. The sport is played worldwide, but especially in Spain, France, the U.S. state of Florida, and Baja California.

Yardangs are common in some regions on Mars, especially in the Medusae Fossae Formation. This formation is found in the Amazonis quadrangle and near the equator. They are formed by the action of wind on sand sized particles; hence they often point in the prevailing direction that the winds were blowing when they were formed. Yardangs exhibit very few impact craters, indicating that the surface exposed is relatively young and the process of erosion may be active. The easily eroded nature of the Medusae Fossae Formation suggests that it is composed of weakly cemented particles, and was most likely formed by the deposition of wind-blown dust or volcanic ash. Yardangs are parts of rock that have been sand blasted into long, skinny ridges by bouncing sand particles blowing in the wind. Layers are seen in parts of the formation. A resistant caprock on the top of yardangs has been observed in Viking, Mars Global Surveyor, and HiRISE photos. Images from spacecraft show that they have different degrees of hardness probably because of significant variations in the physical properties, composition, particle size, and/or cementation.