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?