Pebble size and shape – Geography fieldwork worksheet
Summary
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Instructions and a recording sheet for measuring pebble shape and size. Pebble shape is rated using Power’s Scale by comparing a pebble to reference photos ranging from very angular to well-rounded and recording the matching number. Pebble size is measured by using a ruler to find the length of the longest side and recording the result in millimetres. A table is provided to record angular/round scores and sizes for up to 10 pebbles, calculate an average, and note the site, sample number, and sampling method.
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Measuring pebble shape and size…
Shape
These pictures of pebbles were taken by a scientist called Power. They are used to tell how round or sharp (angular) a pebble is. This is called POWER’S SCALE.
Compare your pebble to the pictures below and see which picture it looks most like. Write down the RED NUMBER on your recording sheet.
1
Very Angular
2
Angular
3
Sub-Angular
4
Sub-Rounded
5
Rounded
6
Well-Rounded
Size
Measure the length of the LONGEST side of your pebble using the ruler below.
Record your measurement in MILLIMETRES.
Measuring pebble shape and size…
Recording sheet
| Pebble | Angular/Round score (1 – 5) | Size (mm) |
|---|---|---|
| 1 | ||
| 2 | ||
| 3 | ||
| 4 | ||
| 5 | ||
| 6 | ||
| 7 | ||
| 8 | ||
| 9 | ||
| 10 | ||
| Average: |
Site:
Sampling Method:
Sample Number: