Waterfalls

Waterfalls

Pencil and paper
Overview
Using this Resource
Connecting to the Curriculum
Marking Student Responses
Further Resources
This task is about erosion over time.

The sequence A shows the erosion at a waterfall over a period of time.

Sequence A

     River    

Diagram A

 Diagram B Diagram C
1 2 3

 

Complete the two diagrams in each of Sequence B and C showing the erosion of these waterfalls over a similar length of time as sequence A.

Key:      Soft rock picture Soft rock              Hard rock picture Hard rock

 

 

Sequence B    

Diagram row B

 Blank diagram Blank diagram
1 2 3
 
 
 
    
Sequence C    

Diagram row C

 Blank diagram Blank diagram
1 2 3

 

Task administration: 
This task can be completed with pencil and paper.
Copyright: 
Graphics: Copyright NZCER. 
Level:
5
Curriculum info: 
Science, Knowledge, Planet Earth
Keywords: 
Earth systems, erosion, rivers, water, sequencing
Description of task: 
Students are provided with a sequence of diagrams showing the erosion of a waterfall by a river over time. Students complete diagrams for two other waterfall erosion sequences. Each waterfall has different combinations of layers of soft and hard rocks.
Curriculum Links: 
Science capabilities
The capabilities focus is brought about by the conversations you have and the questions you ask.
 
Capability: Interpret representations
Scientists represent their ideas in a variety of ways, including models, graphs, charts, diagrams and written texts. This resource provides opportunities to discuss different scientific representations e.g., rock layers. 
Science capabilities: 
Interpret representations
Answers/responses: 
 

Y10 (06/2000)

B

A sequence which results in
Diagram
A sequence which taken further, will lead to the diagram above.
NOTE: The essential feature is for the diagram to show erosion of the middle rock layer, but little/no erosion of other two layers.

2 correct – moderate

1 correct – easy

C

 A sequence which results in


1		 Diagram

3

A sequence which results in layers 1 or 3 eroding as above, (i.e., a large amount of erosion).

2 correct – difficult

1 correct – easy