Segments in this Video

Dangerous Earth: Ice (02:20)


Availability and development of new camera technology is leading to a better understanding of the natural phenomena that governs the behavior of ice in the world around us.

Avalanche (06:01)

Ski Guide Kristoffer Carlsson was swept away by an avalanche while filming with a helmet camera. Carlsson explains what he was thinking and experiencing during the avalanche. Czerski uses the footage to explain why the snow in an avalanche compresses and becomes dense.

Studying Avalanche Danger (05:33)

Czerski illustrates the growth and evolution of snowflakes with video microscopy. Martin Schneebeli, of the institute for Snow & Avalanche Research, explains that snow is actually a "high-temperature" material. Schneebeli has used advanced imaging techniques to probe the inner structure of snow blocks and snow pack to better explain how avalanches form.

Avalanche Experiment (01:47)

Footage shows a skier triggering an avalanche while traversing a slope. Czerski explains the physics of what triggers a snow pack failure and leads to an avalanche.

Everest Avalanche (04:20)

See footage of a deadly avalanche that struck the Mt. Everest Base Camp. Perry Bartelt uses satellite imagery and simulations to discern how the Everest avalanche harnessed such deadly power even though it was not very large in size.

Imaging Avalanches (04:14)

An SLF research facility in Switzerland has been triggering and studying avalanches for twenty years. The research center was struck by a massive avalanche that surprised the scientists. Dieter Issler and his team have used radar to probe the inner workings of avalanches.

Icebergs (05:25)

Czerski transitions from the topic of avalanches to the investigation of icebergs. 95% of icebergs in the Northern Hemisphere come from glaciers on the island of Greenland. Greenland's glaciers are dwarfed by colossal glaciers found on the South Pole.

Concern for Shipping Lanes (05:45)

Icebergs pose a threat to international ocean shipping. The ice patrol was formed to monitor and track icebergs that could pose threats to large ships. Jemma Wadham collects samples from glacier bottoms to investigate how icebergs contribute to ocean ecosystems.

Blue Icebergs (02:41)

This unique phenomenon occurs when icebergs flip upside down due to erosion. Czerski explains the science behind the white appearance of most icebergs.

Penguins on the Ice (03:44)

Peter Fretwell explains how he used satellite imagery to locate penguin colonies from space. These satellite images also show that penguin colonies are starting to inhabit icebergs as well as the sea ice they typically occupy.

Glacial Calving (04:57)

Alun Hubbard sails a research yacht into close proximity to Greenland's Store Glacier to image the front with side scanning sonar. Czerski explains the risks and objectives of this scientific experiment. Hubbard displays the images created from the side scanning sonar and shares the findings of his research.

Climate Change (02:11)

Hubbard speaks about the rising temperatures that are causing massive amounts of ice loss on the Greenland glaciers. Czerski talks about the need to investigate, study, and protect the worlds glaciers and frozen places.

Credits: Dangerous Earth: Ice (00:34)

Credits: Dangerous Earth: Ice

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Part of the Series : Dangerous Earth
DVD (Chaptered) Price: $300.00
DVD + 3-Year Streaming Price: $450.00
3-Year Streaming Price: $300.00



Dr. Helen Czerski examines two of the coldest natural phenomena on Earth: icebergs and avalanches. Avalanches claim hundreds of lives every year. Now scientists are learning how something as tiny, fragile and delicate as a snowflake can transform into something as deadly as an avalanche. Changes in snow can give it the quality of concrete when someone is buried underneath it, and CT scanners are helping scientists understand the changes in the structure of snow which can trigger an avalanche. Icebergs pose a serious hazard to shipping—and as the planet warms up, the number of icebergs calving from the world's glaciers has been increasing steadily. It has never been more important to study the birth and lifecycle of an iceberg, and new technologies are unveiling exactly what happens at the edge of glaciers where icebergs are born and what role increasing ocean temperatures are playing in this process. Satellite images are showing how icebergs can create hotspots for life in the polar seas and how creatures which thrive in polar temperatures are adapting to our changing planet. The result of this flood of new images is pushing the boundaries of what was previously understood—and with better understanding scientists are more able to make sense of these amazing but often destructive forces of nature.

Length: 51 minutes

Item#: BVL141303

ISBN: 978-1-64023-931-9

Copyright date: ©2016

Closed Captioned

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