Environmental Change Investigation
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Environmental Change Investigation
Field notes
A group surveyed the same estuary in late summer for three years. After heavy rain, the stream carried more muddy water. A patch of salt-marsh plants beside the stream had been cleared for a footpath. The team also recorded more litter near the road drain. The observations below were collected at the same marked site each year.
Year
Water clarity (cm visibility)
Salt-marsh cover (%)
Small fish seen in 10 minutes
Year 1
40
80
24
Year 2
28
65
17
Year 3
18
50
10
Investigate the evidence
Use the field notes and survey results to answer the questions. A trend is a pattern across several observations; it does not, by itself, prove what caused the change.
- As water clarity fell, fewer small fish were observed.
- More small fish appeared whenever salt-marsh cover fell.
- The data prove that litter caused every change.
- Water clarity stayed the same across the survey.
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