White icebergs hold ancient trapped air bubbles. When the ice melts it pops and sizzles as that air is released. This is an amazing phenomenon known as "bergie seltzer." Listen to the breath of ancient air. www.debbiemilleralaska.com
Glacier Bay National Park has many tidewater glaciers, the source of these floating icebergs. Nearly all of the glaciers continue to recede because of our warming climate.