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HVA SKAL VI LÆRE?
• Hvordan isen har formet landskapet vårt
• Hvordan en isbre oppstår
• Resultater av isens arbeid
• Bre: Trykk, smelting, og frysing omformer snølagene. Ismasse blir dannet og blir presset sammen til is.
Dannelsen av en isbre skjer over fler år.
• Botnbreer: Som regel små breer.
• Dalbreer: Kan dekke hele daler.
• Platåbreer: Kan dekke store fjellområder.
• Innlandsis: Dekker et helt land eller kontinent.
• Kalving: En prosess som skjer når store stykker av isen faller i vannet
og driver av gårde som store isfjell.
• Ligger ofte på bratte områder
• Ulik hastighet
• U-dal: Har bratte dalsider og flat dalbunn. Formet av isbreer som
langsomt har glidd gjennom og formet dalen til en U.
• Skuringsstriper: Dannes når en bre sliper underlaget. Forteller hvilken
retning isen har beveget seg.
• https://www.nrk.no/video/PS*69195
• Flyttblokker: Store og små steinblokker som
ligger spredt i landskapet.
• Morene: Løsmaterialet består av mer en noen
enkelte steinblokker, som stein, grus, sand og
partikler av leire.
• Bunnmorene: Løsmasse under isen, som
kommer til syne hvis isen smelter bort.
• Endemorene: Finner vi nederst ved enden av
breen, en rygg med løsmasse.
• Største endemorenen i Norge kalles Raet.
Isbreer

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Isbreer

  • 1.
  • 2. HVA SKAL VI LÆRE? • Hvordan isen har formet landskapet vårt • Hvordan en isbre oppstår • Resultater av isens arbeid
  • 3. • Bre: Trykk, smelting, og frysing omformer snølagene. Ismasse blir dannet og blir presset sammen til is. Dannelsen av en isbre skjer over fler år. • Botnbreer: Som regel små breer. • Dalbreer: Kan dekke hele daler. • Platåbreer: Kan dekke store fjellområder. • Innlandsis: Dekker et helt land eller kontinent.
  • 4. • Kalving: En prosess som skjer når store stykker av isen faller i vannet og driver av gårde som store isfjell. • Ligger ofte på bratte områder • Ulik hastighet • U-dal: Har bratte dalsider og flat dalbunn. Formet av isbreer som langsomt har glidd gjennom og formet dalen til en U. • Skuringsstriper: Dannes når en bre sliper underlaget. Forteller hvilken retning isen har beveget seg. • https://www.nrk.no/video/PS*69195
  • 5. • Flyttblokker: Store og små steinblokker som ligger spredt i landskapet. • Morene: Løsmaterialet består av mer en noen enkelte steinblokker, som stein, grus, sand og partikler av leire. • Bunnmorene: Løsmasse under isen, som kommer til syne hvis isen smelter bort. • Endemorene: Finner vi nederst ved enden av breen, en rygg med løsmasse. • Største endemorenen i Norge kalles Raet.

Editor's Notes

  1. I Norge er det om lag 1600 breer. Ikke rester fra istiden, den smeltet for ca 8500 år siden. Vi tror at dagens isbreer er ca 1000 år gamle.
  2. Våren og sommeren er kjølig og mye nedbør på vinterern, vokser breene. Ligger snøen og isen i en bakke, kan massen begynne å gli. De største breene i verden dekkker et helt land, eller kontingent, som Grønland og Antarktis. Dalbre blir kalt for en forvokst botnbre.
  3. Hva kan være årsaker til at isbreene smelter og kalver? En forsterket drivhuseffekt. Isbreer har ulik hastighet øverst og nederst, som resulterer i store sprekker. I Norge kan sprekkene bli 20-30 meter dype. Skuringsstiper: en bre sliper underlaget, løsmaterialet på bunnen av breen jevner ut forhøyniger i berggrunnen.
  4. Raet ble til for ca 10 000 år siden, og morenejord er god dyrkingsjord. Hva består Råde av? Både gamle og nye E6 går over raet. Jæløya utenfor moss, går raet ned i havet, under oslofjorden og opp ved jomfruland ved Telemark. Kommerut ved Halden og inn i Sverige.