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KS3 · 15 minutes · no login

Water cycle stores and flows

All teacher notes · Open the lab · 1906 words · ·

Field photograph or official scientific figure for teaching water cycle. A second photograph for the projector script — not the lab cover. Source: Wikimedia Commons / NASA / USGS / NOAA, public domain or CC.Wikimedia Commons / NASA / USGS / NOAA, public domain or CC

Why this lesson, and why the 3D

Water cycle stores and flows is a fifteen-minute projector lesson, not a homework packet and not a film with a quiz bolted on. Put this hook on the board before you dim the lights: A blackout after a blizzard is weather. The reason there is snow to melt into the reservoir is a closed budget of stores and transfers. By the end of the slot a pupil should be able to name the main stores and transfers, read a drainage-basin overlay, and see how human abstraction lowers a reservoir. Curriculum tags in the header (KS3; GCSE water cycle; NGSS MS-ESS2-4; APES 4.1 / 4.2) are filters, not a flag. The room is worldwide; SI first; International English. Ages on the card (KS3, GCSE, NGSS MS, APES) are a suggested band, not a gate.

Thames and Severn abstraction, Somerset Levels flooding, and western US Colorado reservoirs are the same diagram with different taps. Stores first, then transfers. A flood is a transfer the soil cannot take. A drought is a store running down. GCSE and APES both fail students who draw arrow salad with no boxes. Ice and groundwater dominate fresh water. Rivers are a fast trickle in the global budget, which is why a Thames low flow can still look like a lot of water on a local map.

The 3D is a named, inspectable object. Click the part, not a caption. If the model will not spin, the Why panel still carries the mechanism, the two photographs, and the film. Do not apologise for the model. Drive it. A silent spin teaches a screensaver. A named mesh that changes under a slider teaches the process.

Fifteen minutes on the projector

Name stores first. Ocean, atmosphere, ice, groundwater, soil, lakes. Chase one particle from ocean to snow to river and back. Toggle the basin overlay. Open the abstraction tap. Ask who loses: the ocean or the town. Rivers are a flow, not a major global store. A flood is a transfer the soil cannot take. Stores first, then arrows. That is the misconception to kill. Space, L, R, P. Finish in Check.

Open the lab full screen (F). Labels on (L). Speak the first step before you touch a slider: Stores: ocean, atmosphere, ice, groundwater, soil, lakes. Flows: evaporation, transpiration, condensation, precipitation, interception, infiltration, runoff, groundwater flow. Then the second: Toggle the drainage-basin overlay. Open the abstraction tap and watch the reservoir fall. The ocean does not notice; the town does. Then the third: Globally the cycle is closed. Locally a basin can be in deficit. Hydrographs (a later skills lab) are this diagram plotted against hours after rain.

The sliders that earn their keep are Abstraction; Drainage basin. Space plays; arrows nudge time; R resets. Parameters the URL can remember: abstraction, basin. If you only have eight minutes, skip the last step and finish in Check. Projector layout (P) is for the back row: one idea, large type, the model still live.

Name stores first, then chase one particle from ocean to snow to river and back. Toggle the basin. Then open abstraction and ask who loses: the ocean or the town. Keyboard: Space, L labels, R reset, P projector. The abstraction slider is the tap. Leave it closed until stores are named. Then open it.

The in-site film is “How Can Rain Create Conflict? Crash Course Geography #11” (Crash Course Geography, about 11 min, Crash Course / Complexly on YouTube. Standard YouTube licence. Educational embed, autoplay off.). Autoplay is off. Play one minute if you need a second voice; do not let the film eat the slot. The 3D still has to move under your hand.

What the third row will get wrong

You will hear the misconception before you have finished the first sentence. Write the false claim on the board and leave it there until the model has contradicted it. Do not skip this. A fluent pupil can recite the hook and still believe the false sentence.

“Water is used up.” — no. The global mass is conserved. Quality, location, and timing change. A dry reservoir is a local budget failure.

“Rivers are a major global store of fresh water.” — no. Ice then groundwater dominate fresh water. Rivers are a fast transfer, a trickle in the budget.

“The cycle is a circle of arrows with no stores.” — no. Stores first, then transfers. Abstraction mines a named store. A flood is a transfer the soil cannot take.

Pitfalls to keep in your pocket: Arrow salad with no stores. Teaching the cycle as if rivers were a major global store. Do not let a pupil leave thinking the 3D is a photograph. It is a teaching model. Where vertical exaggeration exists, T collapses it and the caption says so. A labelled lie of scale is honest. An unlabelled one is a cartoon.

Two places, not a slogan

Water is conserved. Stores: ocean, ice, groundwater, lakes, soil, air. Transfers: evaporation, transpiration, precipitation, infiltration, runoff, throughflow, groundwater flow. What moves: the tracer particle, the abstraction tap. What does not: the closed budget. What is conserved: mass of water, in school language. Abstraction mines a named store — a town taking from a river or an aquifer — it does not delete the ocean. Arrow sizes here are teaching, not USGS fluxes to the litre. The particle is a tracer, not a molecule census. Toggle the basin overlay to see a catchment as a budget boundary. The lie: pretty arrows. The skill: name the store before you chase the transfer. Rivers are a flow, not a major global store.

The first place to land is Thames / Severn. The second is Colorado River reservoirs. Same process, different rock or climate. If a pupil can only name one place, they have a postcard, not a mechanism. Atlas entries for those names are a click from the case list; send them back to the lab with one sentence they can say in Check.

Do not flatten the comparison into “this country versus that country.” Name the landform. Holderness is till, not chalk. Hawaii is a hotspot, not an island arc. Yosemite is a glacial trough, not a river canyon. The 3D is allowed to be schematic; the place names are not allowed to be sloppy.

Figures and the film

Field photograph: Water leaving a surface as vapour and returning as rain. Water leaving a surface as vapour and returning as rain. This is the classroom sense of water-cycle: a named landform, process, or object. Source: Wikimedia Commons / NASA / USGS / NOAA, public domain or CC. Credit: Wikimedia Commons / NASA / USGS / NOAA, public domain or CC.

Mechanism photograph: Field photograph or official scientific figure for teaching water cycle. Field photograph or official scientific figure for teaching water cycle. A second photograph for the projector script — not the lab cover. Source: Wikimedia Commons / NASA / USGS / NOAA, public domain or CC. Credit: Wikimedia Commons / NASA / USGS / NOAA, public domain or CC.

Two photographs, two jobs. The field picture is the place. The mechanism picture is the process. Do not run the lesson on a single Apollo Earth disc. A carbon-cycle class is a forest and a seam, not a blue marble. An ENSO class is a Pacific temperature map, not Africa from Apollo 17.

Words they must be able to say

Say these out loud once while you click the matching mesh. If a word has no mesh, it still has a photograph in Terms.

Store: A place water sits: ocean, ice, aquifer, lake, soil, air. Transfer: A flow between stores. Watershed: The boundary of a drainage basin. Exam language also accepts “Drainage divide”. Abstraction: Human removal of water from a store. Interception: Rain caught on vegetation before it hits the ground. Abstraction: Water taken from a named store for people. A tap on a river or aquifer, not a deleted ocean. Residence time: How long a molecule stays in a store. Ice is long. Rivers are short. Evapotranspiration: Evaporation plus transpiration. A land transfer back to air. Exam language also accepts “ET”.

Exam-language toggle (the Teacher tab) swaps UK/US pairs where they exist — levée/levee, arête/arete — so a mixed room is not punished for spelling.

Close the slot

Arrow sizes are teaching, not USGS fluxes to the litre. The particle is a tracer, not a molecule census. Without the 3D view: name stores, then transfers. Ocean, ice, groundwater, soil, lakes, air. Evaporation, precipitation, infiltration, runoff. Abstraction mines a store. Rivers are a flow. A flood is a transfer the soil cannot take. That is enough for Check, and enough to read a UKCEH or USGS water-cycle poster without drowning in arrows.

Finish in Check — ten questions, not a mood. The bank mixes definition, process, the misconception you just killed, a named place, and a read-the-model item (click the part; T). If a pupil can only recite the hook, they have not used the geometry. Wrong answers still show the one-line explain. Do not skip the explain.

Sources on the Teacher tab are the trail, not a bibliography to copy. USGS Water Science School; NOAA water cycle; UK Centre for Ecology & Hydrology.

Link back to the live lab and keep the same slug. Do not invent a parallel worksheet that contradicts T, SI, or the named parts.

This note is worldwide. Curriculum tags (KS3; GCSE water cycle; NGSS MS-ESS2-4; APES 4.1 / 4.2) are filters, not a flag. A class in Nairobi, London, or Shanghai can use the same 3D. Ages (KS3, GCSE, NGSS MS, APES) are a suggested band. If a sentence only works in one exam board, rewrite it before you project it.

Write these three lines on the board before you dim the lights. One: A blackout after a blizzard is weather. The reason there is snow to melt into the reservoir is a closed budget of stores and transfers. Two: the misconception “Water is used up.”. Three: the named parts they must click. Then drive the model. Check is ten questions covering definition, process, the misconception, a place, and a read-the-model item. Do not skip the explain on a wrong answer.

Board, units, and what not to say

SI first. Metres, kilometres, degrees Celsius, metres per second. A conversion in brackets is courtesy, not a second system. Do not let a pupil leave thinking the 3D is a photograph. It is a teaching model. Where vertical exaggeration exists, T collapses it and the caption says so.

Do not say “teaching mesh”, “sprinkle”, or “thin free surface not a fat pipe” out loud. Say the landform. Seasons are ~23.44° of axial tilt, not Earth–Sun distance. The outer core is liquid; S-waves do not pass. Yosemite is a glacial U-trough. San Andreas is a transform. Hawaiʻi and Yellowstone are hotspots. Florida is not a glacial trough.

If the room is noisy, projector layout (P) is the back-row setting: one idea, large type, the model still live. Full screen (F). Labels (L). Space plays. Arrows nudge time. R resets. The URL can remember abstraction, basin. Send them home with the same link; there is no login.

In-site film

How Can Rain Create Conflict? Crash Course Geography #11. Crash Course Geography. Crash Course / Complexly on YouTube. Standard YouTube licence. Educational embed, autoplay off. Autoplay off.