Water cycle: evaporation is not disappearance
הוצג| English | משמעות |
|---|---|
| precipitation/prɪˌsɪpɪˈteɪʃn/ | משקעים |
| condensation/kɒndenˈseɪʃn/ | עיבוי |
What would explain this observation?
- Water evaporating from a pond has changed state and location. The molecules can later return as precipitation 降水 rather than being used up.
Build the model
- Water evaporates from seas, lakes and other wet surfaces; plants also release water vapour through transpiration.
- Vapour condenses into droplets as it cools, forming clouds.
- Precipitation returns water to land and sea.
- Water on land can drain through rivers or move into soil and groundwater before returning to the sea.
- precipitation: Water falling from clouds to the surface.
- condensation 凝结: Change of water vapour into liquid droplets.
Which process changes water vapour into liquid droplets?
רמת קושי 1/5 · 100 מטבעות + בונוס קטן בהשלמה הראשונה היום
Condensation is vapour cooling into liquid droplets - how clouds form. Evaporation runs the opposite way, and feeding belongs to food chains.
Match each technical term to its precise meaning.
רמת קושי 2/5 · 140 מטבעות + בונוס קטן בהשלמה הראשונה היום
Use the definitions to distinguish related quantities and processes.
Choose evidence that can test it
- Freshwater supply supports plants and animals on land.
- Organisms take up water and later return it through processes including excretion, respiration and transpiration.
- The water cycle includes both abiotic stores and biological transfers.
- A diagram can simplify the system, but not all rainwater immediately travels through the same route.
In the lab: Trace processes on a supplied diagram and distinguish changes of state from movement between places. In a school model, observe teacher-approved evaporation or condensation without assuming it reproduces the scale of global circulation. For balances, define the store, time interval and any inflow or outflow omitted.
Which two habits make the investigation or model in this case more defensible?
רמת קושי 2/5 · 140 מטבעות + בונוס קטן בהשלמה הראשונה היום
Stating the conditions and assumptions lets others repeat the work exactly, and recording the supporting evidence lets them check the conclusion. Hiding disagreeing results removes the evidence that could challenge a wrong conclusion, and one measurement can never establish a wider claim.
Work from known quantities
- Known: a fictional pond begins with 200 water units, gains 40 in rain and loses 25 by evaporation and 15 by drainage.
- Final store = 200+40−25−15 = 200 units.
- An unchanged store can still involve large transfers; it does not mean the cycle stopped.
Your turn: A pond begins with 150 units, gains 30 and loses 18 by evaporation plus 12 by drainage. Find final store.
A pond begins with 150 units, gains 30 and loses 18 by evaporation plus 12 by drainage. Find final store.
רמת קושי 2/5 · 140 מטבעות + בונוס קטן בהשלמה הראשונה היום
The result is 150 water units. Known: pond starts at 150 units; gains 30; loses 18 by evaporation and 12 by drainage. Final store = 150 + 30 - 18 - 12 = 150 units. The store is unchanged even though 30 units flowed in and 30 flowed out.
Check the conclusion and its limits
- Evaporation is liquid changing to vapour; condensation is the reverse.
- Precipitation is not the same as transpiration.
- Water can be recycled while its availability at a particular habitat changes, so global cycling does not guarantee local water supply.
Not true: An unchanged water store proves there were no transfers. An unchanged store means inflows and outflows balance, not that nothing moved. Large transfers can hide behind a constant level - that is what makes it a cycle.
- Water evaporates from seas, lakes and other wet surfaces; plants also release water vapour through transpiration.
- Freshwater supply supports plants and animals on land.
- Watch for: evaporation is liquid changing to vapour; condensation is the reverse.
An unchanged water store proves there were no transfers.
רמת קושי 1/5 · 100 מטבעות + בונוס קטן בהשלמה הראשונה היום
An unchanged store means inflows and outflows balance, not that nothing moved. Large transfers can hide behind a constant level - that is what makes it a cycle.
Water falling from clouds to the surface: write the technical term.
רמת קושי 1/5 · 100 מטבעות + בונוס קטן בהשלמה הראשונה היום
precipitation means Water falling from clouds to the surface.