Iceberg YouTube Video: What's Below the Tip of the Iceberg? - Camille Seaman

TL;DR

This iceberg YouTube lesson explains that the bottom of an iceberg contains most of its immense bulk, while usually only 1/9 of its volume rises above water. It also covers how glaciers create icebergs, why compressed ice looks blue, how icebergs travel and melt, and how they support marine ecosystems. Read on to discover what lies below the tip of the iceberg.

Transcript

Have you ever heard the term, "tip of the iceberg"? You know that icebergs are mostly underwater, their immense bulk hidden beneath the water. But why is that so? Well, the density of pure ice is less than that of sea water. Usually only 1/9 of the volume of an iceberg is above the water. The shape of the underwater portion is difficult to discern ... Read More

Key Insights

• 💁 Icebergs are formed by glaciers and can live for three to six years, floating and being carried by ocean currents.
• 😀 They can travel thousands of miles, interrupting shipping lanes in certain areas.
• 🏂 Icebergs support diverse ecosystems, including species like icefish, jellyfish, siphonophores, snow petrels, whales, seals, and penguins.
• 🫠 Melting icebergs create thermal currents and a pool of cold, fresh water around them.
• 👨‍🦳 The color of an iceberg varies based on compression, with blue icebergs being more compressed and white icebergs having more air trapped inside.
• 🫠 Icebergs can impact ocean currents due to temperature variations caused by their melting.
• 🧑‍🌾 They are a common sight in far northern or southern areas, but can drift to unexpected locations, like Bermuda.

Questions & Answers

Q: What does this iceberg YouTube lesson explain about the bottom of an iceberg?

The bottom of an iceberg contains most of its immense bulk beneath the water. Usually only 1/9 of the iceberg's volume is above the water because pure ice is less dense than seawater.

Q: Why is the underwater shape of an iceberg difficult to predict?

The underwater portion cannot be reliably discerned by looking at the part above the surface. Most of the iceberg is hidden beneath the water, which is the basis of the expression "tip of the iceberg."

Q: How do glaciers create icebergs?

Glaciers build layer upon layer of fresh-water ice over thousands of years while compressing, moving, and receiving more snow. Gravity pulls them toward the sea, where part of a glacier may calve off and become an iceberg.

Q: How long does an iceberg usually survive after breaking away?

An iceberg usually lives for three to six years after separating from a glacier or ice shelf. Ocean currents and tidal movements carry it while waves, melting, land, and collisions gradually break it apart.

Q: Why do melting icebergs make a fizzing sound?

The fizzing sound is called Bergie Seltzer. It occurs when melting reaches compressed air bubbles trapped in the ice, causing each bubble to burst with a popping sound.

Q: How large is a very large iceberg?

An iceberg is officially considered very large when it rises more than 270 feet above sea level and extends more than 670 feet in length. The transcript compares its height to 27 stories of blue ice.

Q: Why are some icebergs blue while others are white?

Hundreds of years of compression can force air bubbles out, producing pure ice with very little trapped air that appears blue. Ice containing more air and surface edges reflects light as white.

Q: What lives on and around icebergs?

Icebergs support mobile ecosystems containing young icefish, jellyfish, siphonophores, krill, and snow petrels. Whales, seals, and penguins also gather around them, while melting fresh water creates colder water and thermal currents nearby.

Summary & Key Takeaways

• Icebergs are mostly underwater, with only a small portion visible above the surface due to the density of pure ice.

• They are created by glaciers, which constantly compress, move, and add layers of ice over thousands of years.

• Icebergs have complex ecosystems, impact ocean currents, and support a variety of marine life.