Assessment 1

Cracks, Caves, Arches and Stacks

Let’s get started…Let’s get started…

Record the 7 answers on Mini White

boards!

Waves do three things.Waves do three things.Write down the missing keywords .Write down the missing keywords .

1.1. Waves _____ the coast.Waves _____ the coast.

2.2. Waves ______ the eroded material.Waves ______ the eroded material.

3.3. Waves ______ this material in Waves ______ this material in sheltered areas where they lose sheltered areas where they lose their energy.their energy.

4. Write down the keyword 4. Write down the keyword described below:described below:

Waves force water into cracks under Waves force water into cracks under pressure. This helps break up the pressure. This helps break up the rock.rock.

5. Write down the keyword 5. Write down the keyword described below:described below:

Water dissolves soluble material Water dissolves soluble material from the rock.from the rock.

6. Write down the keyword 6. Write down the keyword described below:described below:

Waves fling sand,pebbles and large Waves fling sand,pebbles and large stones against the rock. This acts as stones against the rock. This acts as sand paper wearing away the rock.sand paper wearing away the rock.

7. Write down the keyword 7. Write down the keyword described below:described below:

Waves knock together the pieces of Waves knock together the pieces of rock broken off by erosion. These rock broken off by erosion. These wear down into smaller and smaller wear down into smaller and smaller pieces.pieces.

The rock wears down into The rock wears down into shingle shingle (Pebbles) (Pebbles) and and sand.sand.

AnswersAnswers

1.1. Waves Waves erodeerode (wear down) the (wear down) the coast.coast.

2.2. Waves Waves transporttransport (move) the (move) the eroded material.eroded material.

3.3. Waves Waves depositdeposit (drop) this material (drop) this material in sheltered areas where they lose in sheltered areas where they lose their energy.their energy.

4. 4. Hydraulic ActionHydraulic Action Waves force water into cracks Waves force water into cracks under pressure. This helps break up the rock.under pressure. This helps break up the rock.

5. 5. SolutionSolution Water dissolves soluble material from the rock.Water dissolves soluble material from the rock.

6. 6. ABRAABRAsionsion Waves fling sand,pebbles and large stones Waves fling sand,pebbles and large stones against the rock. This acts as sand paper wearing away the rockagainst the rock. This acts as sand paper wearing away the rock

7. 7. ATTATTrition rition Waves knock together the pieces of rock Waves knock together the pieces of rock broken off by erosion. And smaller pieces. These wear down broken off by erosion. And smaller pieces. These wear down into smaller.The rock wears down into into smaller.The rock wears down into shingle (Pebbles) shingle (Pebbles) and and sand.sand.

Erosion of a headlandErosion of a headland

DescribingDescribing and and ExplainExplain how a headland is how a headland is eroded to formeroded to form

CracksCracks CavesCaves ArchesArches StacksStacks StumpsStumps

Creative thinkers, independent enquirers, self managers…

Make sure you explain how waves erode the

headland

Hydraulic Action AbrasionAttrition Solution

Make sure that you explain and

link in weathering!

Title: Erosion of a headlandCaves, Arches, Stacks and

stumpsTask: Write an essay to describe and explain how a headland is eroded and

weathered to create caves, arches, stack and stumps.

You can include a diagrams to describe the landforms

Explain HOW the processes involved Use the self assessment and peer assessment sheet

to ensure you have covered all the ideas!

Use your earlier work and the information on the following slides to help you.

This work will be peer assessed and you will receive a level for it.For a high level link the processes to show how they all work

together to wear the headland!

TaskTask

Introduce a headland.

Describe the landforms of a headland You could use a labelled diagram!

Describe the sequence how they formed.

Explain where and how waves erode the cliff.Explain where and how the headland is weathered.Explain how and link all the processes to show that they work together to create the landforms.

Year 8 Erosion of a headland

Self assessment

Peer assessment 1

Peer assessment 2

Peer assessment 3

Does it describe: Crack Secure Cave Secure Arch Secure Stack Secure Stump Secure Does it describe the sequence that the headland is eroded?

Secure

Does it explain how these features were formed:

Crack Secure Cave Secure Arch Secure Stack Secure Stump Secure Does it explain how the following process work:

Hydraulic Action Secure Abrasion Secure Solution Secure Attrition Secure Does it explain how these weathering processes work?

Chemical Exceeding Freeze Thaw Exceeding Does it explain how: Exceeding Wave erosion attacks the base of the cliff?

Exceeding

Weathering attacks the top and sides of the cliff?

Exceeding

Does it clearly link weathering and wave erosion together to show how the headland is worn down by all the processes interacting together?

Highest

The video links below will help The video links below will help you visualise these land forms:you visualise these land forms:

http://www.bbc.co.uk/learningzone/clips/coastlines-caves-arches-and-stacks/8432.html

Remember the diagram you drew?

Remember the Big Picture you worked in teams to create?

Geog 2 describes the process of a headland being eroded as shown below:

Crack

Cave

Arch

Stack

Stump

Erosion of a Headland

You’ll need to explain ways that You’ll need to explain ways that waves erode the rocks:waves erode the rocks:

1.1. Hydraulic ActionHydraulic Action Waves force water into cracks Waves force water into cracks under pressure. This helps break up the rock.under pressure. This helps break up the rock.

2.2. SolutionSolution Water dissolves soluble material from the rock.Water dissolves soluble material from the rock.

3.3. AbrasionAbrasion Waves fling sand,pebbles and large stones against Waves fling sand,pebbles and large stones against the rock. This acts as sand paper wearing away the rockthe rock. This acts as sand paper wearing away the rock

4.4. Attrition Attrition Waves knock together the pieces of rock Waves knock together the pieces of rock broken off by erosion. And smaller pieces. These wear down broken off by erosion. And smaller pieces. These wear down into smaller. The rock wears down into into smaller. The rock wears down into shingle (Pebbles) shingle (Pebbles) and and sand.sand.

Water trickles into cracks. In icy weather the water freezes and expands as it forms ice. This forces the cracks wider until the rock breaks up.

Remember Science?

Water reacts with Carbon dioxide in the air. The water becomes slightly acidic. (Carbonic acid). This dissolves the rock.

You should also explain how weathering weakens the rocks…