Ice, Ice-Cube!
Transcript: When glaciers start melting, they deposit sediment because they can't carry it anymore. This sediment is called till. In order for a glacier to be normal, there must be an equal ratio of snow melt to snowfall. This balance called the equilibrium, and when it changes a glacier advances or retreats to keep it equal. Types of Glaciers A glacier is a large moving mass of ice and snow. Because they are so large, they flow extremely slowly. They range from the size of a football field up to hundreds of kilometers long. Is a sheet of ice rarely thicker than 5m. They are formed from frozen sea water and break easily. Ice Fields Why do glaciers advance/retreat? Is a huge mass of ice and snow that occurs mainly near the North and South Poles. They are so thick that they can almost bury the mountain ranges they are on. Ice Caps How are glaciers formed? Climate change causes glaciers to advance/retreat faster and also to melt faster. A glacier is formed when fallen snow compresses to form large, thick ice masses. The snowflakes become grains, ice crystals then ice. Advancing/Retreating Glaciers . Pack Ice Related terminology Climate change is referred to as a long term change in the Earth's climate. Global warming is NOT a synonym for climate change, global warming is only referring to the average temperature near the Earth's surface. Valley Glaciers If a glacier is moving, its weight can scrape at the land beneath it. When a glacier erodes land like this, it is called glacial erosion. The erosion transports the dirt and rocks to other places, resulting in glacial landforms. The gouges in the bedrock left behind by glaciers are called striations. Valley glaciers often carve mountains since they are flowing down them. Common Features By Holly and Ava Ice caps form on relatively flat land and flow outwards from their center. They cover a large area of land. Located in Alaska All about glaciers! A glacier advances when it is flowing faster than it is melting. A glacier retreats when it is melting faster than it is moving. Some glaciers are retreating quickly, partially because of global warming. Advancing=Downvalley and Retreating=Upvalley Located in Jasper National Park Ice Ages Well known glaciers How Climate Change affects glaciers Icebergs How do glaciers affect landforms? When a glacier flows over a steep cliff The Hubbard Glacier What is a glacier? Glaciers form where snow remains year round. The pressure from all the snow, creates ice and glaciers. Is an upland area of ice that feeds two or more glaciers Sources An ice age is when the Earth's oceans freeze over for a long time. Scientists are guessing that ice ages are caused by reductions in energy given by the sun and changes in the tilt of the Earth. Located in Alaska Thanks for watching! We hope you learned a lot! The Athabasca Glacier Icefall http://www.scenicglaciers.com/glaciers-of-the-world.html http://nsidc.org/cryosphere/glaciers/questions/what.html http://www.nrdc.org/globalwarming/fcons/fcons4.asp http://dictionary.reference.com/browse/climate+change http://nsidc.org/cryosphere/quickfacts/icesheets.html https://www.google.ca/maps The Science Focus 8 Textbook Formed in mountain ranges. They grow because the temperature in the mountains is low enough. Flow down into valleys and can be very long, sometimes reaching sea level. The Columbia Glacier Continental Glaciers How do glaciers advance/retreat? Ice, Ice-Cube! Where are glaciers formed? All glaciers have an accumulation area (where snow gathers), an ablation area (where melting and evaporation mainly occur), crevasses (giant cracks caused by friction), and moraines (long bands of debris left behind by glaciers) Climate Changes Are large chunks of ice that break off of continental glaciers.
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