Prepared By Matt Henne

1
What Is A Glacier?

• Prepared By Matt Henne
• A Science Lesson for 11th and 12th Graders

2
How Are Glaciers Formed?

• Prepared By Matt Henne
• A Science Lesson for 11th and 12th Graders

3
A Glacier is

• A large accumulation of many years of snow,
  transformed into ice. Also could be thought of
  as rivers of ice.

4
How a Glacier Forms

• Snowfall builds up and snowflakes are packed into
  grains. Melted snow quickly refreezes forming
  ice.

5
Anatomy of a Glacier.

• Accumulation Zone - Where a glacier gains snow
  and ice through snowfall and compressioin.
• Ablation Zone - Where the galcier loses ice
  through melting and evaporation.
• Equilibrium line - Divides the two areas.

6
Two Processes that Create Glacier Landforms.

• Erosion - Process by which material is worn away
  from the Earths surface.
• Deposition - The laying down of matter by a
  natural process.

7
How a Glacier Moves

• A glaciers motion is called advance and retreat.
• They move by internal Deformation which is due to
  pressure and stress.

8
Average Daily Movement

• A glacier moves at an average rate of three
  inches to six feet a day.

9
What is Calving?

• Calving is when chunks of ice break off at the
  end of a glacier.
• Ice breaks because the forward motion of the
  glacier makes the end unstable.
• The chunks of ice are called icebergs.

10
What Does The Color of The Iceberg Tell Us?

• Color tells us where it came from.
• Color tells us a lot about what its made of.

11
Colors of Icebergs and What it Means.
12
Resources

• I used www.asf.alaskaedu2222/ to gather
  informatioin for this presentation.

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