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condensation
Vapour forms liquid droplets.
Class 6 · Bangla Version · General science
Earth and environmental science
Use linked processes to explain water and environmental change.
Shared cross-level core and stretch unit. Start with the core questions, then use the stretch example for deeper work. The same unit is available in related class and board pathways; it is not a full grade-specific or examination-specification course. A teacher should select the appropriate depth and further topics.
Learn the idea
Water evaporates, condenses and moves through precipitation and runoff. Carbon also moves among organisms, air, water and rocks. Weather describes short-term conditions; climate describes patterns over many years. A single hot or wet day cannot establish a long-term trend.
Worked example
Water vapour cooling into droplets on a cold surface is condensation. A daily temperature observation describes that day; comparing long records with the same measurement methods addresses longer-term patterns.
- Name the process and location.
- Track where the matter goes.
- Match the conclusion to the timescale of evidence.
Stretch example
A fictional area receives 100 mm rain. If 35 mm becomes runoff and 25 mm is stored, the remaining 40 mm is assigned to other measured/modelled pathways in a balanced simplified water budget. Real budgets need all relevant inputs and outputs.
Your written practice
Show your working on paper and enter your answer here. If it does not match, compare the model and try again.
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runoff
Runoff is surface movement of water.
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no
A long-term pattern needs a suitable long record.
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Less interception and reduced soil protection can allow more water to move over the surface.
Give a mechanism and recognise that soil and slope also matter.
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Changes in location or instruments could create differences unrelated to the environment.
Identify a measurement explanation.
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40
Subtract the two specified pathways.
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It may include unmeasured flow, storage change or measurement error.
Do not label a residual without additional evidence.
Water pathway map
Map water movement around a fictional school during rainfall.
Review with a guardian or teacher
- Label infiltration and runoff.
- Identify where observations are needed.
- Propose one change and explain its possible effect.
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