Key question: What on earth is glaciation?
L.O. To understand that Britain was once covered in ice To understand how glaciers are formed
Glaciation
A glacial period is when ice advances and temperatures fall, we call this an ‘Ice Age’.
When we have warming, the ice will retreat. These are called interglacial periods.
Figure 1.
Lesson Objective: What on earth is glaciation?
GCSE exam question
Describe the changes in global temperatures shown in Figure 1.........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
(4 marks)
Lesson Objective: What on earth is glaciation?
THINK GSE;G eneral – What is generally happening S pecifics – data from the
graphsE xceptions – what year, country etc are the exceptions,
if any?
Model Answer
Temperatures fluctuate, but generally they have
…………………………
Specifics?
Exceptions?
Lesson Objective: What on earth is glaciation?
Lesson Objective: What on earth is glaciation?
Ice coverage in British
Isles during last Ice Age
Map showing the extent of the ice over the UK 18 000 years ago
Ice margin
ICE MOVEMENT
Surbiton
1. Draw the extent
of the ice, during the last ice age on your map
2. Label Surbiton too
Lesson Objective: What on earth is glaciation?
Can you complete this….or write your own
• During the last ___ ___ (about 10,000 years ago) one third of the ______ and the majority of the _______ was covered in ___.
• Since then, the climate has become _________ and most of the ice has melted away.
UK warmer ice age
world ice
Present day ice coverage
Ice now covers 10% of the world’s surface. Today there are two large areas of ice in the world. The largest is Antarctica and the other Greenland. There are some smaller areas of ice, in Iceland and in mountainous areas. Often these are small fingers of ice, which we call glaciers.
Can you identify these mountain ranges??
What is a Glacier? Video clip (from 5.55-8.00)
• Put the boxes in the correct
order!
R. All the weight of the ice pushes the glacier down the
mountain
C.The new layers of snow compact last years layer
A. It snows again next winter
L. The spring and summer are cold
so the snow doesn’t melt
G. Snow collects throughout the
winter
I. Air is therefore squeezed out if
the snow – turning it to ice.
E. With no air the glacier turns a
strange blue colour
Lesson Objective: What on earth is glaciation?
You’re the teacher….
• Using the mini whiteboards and this photo, without looking at your notes, can you describe how a glacier forms?
Lesson Objective: What on earth is glaciation?
Lesson Objective: What on earth is glaciation?
Make a snowflake……
The south Cascade glacier in Washington State USA has been monitored by geologists for over 40
years.
Glaciers are found in every continent in the world
Glaciers can move up to 30cm a day during ‘surges’.
Homework cover your
snow flake in
interesting facts about
glaciers and bring a
mini mars bar to next
lesson!
Lesson Objective: What on earth is glaciation?
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