A Vulcanian eruption is a short, violent, relatively small explosion of viscous magma (usually andesite, dacite, or rhyolite). This type of eruption results from the fragmentation and explosion of a plug of lava in a volcanic conduit, or from the rupture of a lava dome (viscous lava that piles up over a vent).
Sail & Sign Card / Account. You will receive your Sail & Sign Card when you first check-in at your embarkation port. Sail & Sign is Carnival's onboard cashless credit program, which allows you to charge all your services, gratuities and purchases during your cruise to your cabin. Your Sail & Sign Card is also your cabin key and boarding card.
Carnival is the parent company of various cruise brands in nearly every part of the world under names including Carnival Cruise Lines, Holland America, Princess Cruises, Seabourn, Costa Cruises, and more. One way Carnival has made major gains lately in that it's leading the industry in fuel efficiency.