They must have been material from the sudden debris flows in a sand avalanche, the geologists concluded.
2.
Sand becomes a key gameplay mechanic and players can manipulate it at scripted moments in the game, such as triggering a sand avalanche to bury enemies alive.
3.
To prevent the sand mechanics from turning gimmicky, the team introduced multiple ways for players to use sand as a weapon, such as the player's ability to trigger dust clouds by throwing grenades on sand and cause a sand avalanche by shooting weak structures and supports.