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A-level · 15 minutes · no login

Wind landforms

All teacher notes · Open the lab · 1961 words · ·

Field photograph or official scientific figure for teaching aeolian. 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

Wind landforms 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: Yardangs are carved. Barchans are built. Wind is a sculptor where vegetation is thin. By the end of the slot a pupil should be able to orbit a yardang ridge and a barchan, and play sand along the horns. Curriculum tags in the header (A-level; NGSS MS-ESS2-2) are filters, not a flag. The room is worldwide; SI first; International English. Ages on the card (GCSE, A-level, NGSS MS) are a suggested band, not a gate.

Yardangs are carved. Barchans are built. Wind is a sculptor where vegetation is thin. The Dust Bowl is the process without needing a Chinese exam map as the hero: 1930s Great Plains, a plough, a drought, a wind that took the A horizon off the prairie. Deflation and transport of farmed silt, not a textbook dune sea. Grand Canyon country is dryland weathering and wind on rock and pavement as much as sand. UK blown sand on some coasts and bare peat in a dry spring are the small cousins. GCSE is light here; A-level and NGSS MS-ESS2-2 still need carved versus built, and the honesty that many deserts are rock. Dunes need a sand supply. Land use plus drought plus wind is the Dust Bowl sentence, not a morality play.

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

Orbit the yardang. It is a wind-carved ridge, streamlined, wind-parallel. Then the barchan. It is built: a crescent, horns downwind. Carved versus built. Say the pair. Play sand along the horns. Horns point downwind, not upwind. All deserts are not dune seas. Many are rock and pavement. Dunes need a sand supply. That is the misconception. Aeolian work needs loose sediment and enough wind, often sparse vegetation. Dust Bowl was land use plus drought plus wind, not a single-country exam map as the hero. Vertical exaggeration is ×8 and labelled. This is not the homepage special effect. Keep it as a process. Finish in Check.

Open the lab full screen (F). Labels on (L). Speak the first step before you touch a slider: Yardang: streamlined ridge, wind-parallel. Then the second: Barchan: crescent, horns downwind. Then the third: World examples, not a single-country exam core.

Time, labels, and T (true scale) are the whole desk. Play walks the process; T removes the vertical lie where one was drawn. Space plays; arrows nudge time; R resets. Parameters the URL can remember: t, labels, true scale. 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.

Orbit the yardang. It is a wind-carved ridge, streamlined, wind-parallel. Then the barchan: a crescent, horns downwind. Carved versus built. Say the pair out loud. Play sand along the horns and watch the crescent migrate. Keyboard: space, arrows, L labels, R reset. Vertical exaggeration is ×8 and labelled. This is not the homepage special effect. Keep it as a process. Finish in Check. All deserts are not dune seas. Dust Bowl was land use plus drought plus wind, not a dune-sea poster.

The in-site film is “How Does the Earth Create Different Landforms? Crash Course Geography #19” (Crash Course Geography, about 13 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.

“All deserts are dune seas.” — no. Many are rock and pavement. Dunes need a sand supply.

“A barchan’s horns point upwind.” — no. Horns point downwind. The crescent migrates that way.

“The Dust Bowl was a textbook barchan field.” — no. It was land use plus drought plus wind: deflation of a farmed A horizon, not an erg as the default landform.

Pitfalls to keep in your pocket: Making this the homepage hero. Teaching every desert as a dune sea. Pointing barchan horns upwind. 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

A yardang is a streamlined wind-eroded ridge, wind-parallel — carved. A barchan is a crescent dune, horns pointing downwind — built. Play the lab and sand walks along the horns; the crescent migrates downwind. Aeolian work needs loose sediment and enough wind, often sparse vegetation. All deserts are not dune seas. Many are rock and pavement. Dunes need a sand supply. Dust Bowl was land use plus drought plus wind, deflation of an A horizon, not a barchan field as the default landform. Yardangs and barchans are the world-example kit. Vertical exaggeration is labelled ×8 so the carved ridges and the built crescents read from the back of the room. True dune relief on a table would be a film of sand. The dunes are a schematic pair, not a traced erg. Horns point downwind, not upwind, not always north. Carved versus built. Say the pair. A nabkha is sand trapped at a plant; that is vegetation as roughness, the opposite of a bare Dust Bowl field. Wind direction is the arrow in this lab. Saltation hops grains; suspension takes dust. The 1930s black blizzards were suspension of farmed silt, not a yardang lesson first.

The first place to land is Dust Bowl. The second is Dryland weathering. 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: Barchan dunes: horns downwind. Sand, a scarce supply, a steady wind. Credit: Wikimedia Commons, CC BY.

Mechanism photograph: Field photograph or official scientific figure for teaching aeolian. Field photograph or official scientific figure for teaching aeolian. 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.

Yardang: Streamlined wind-eroded ridge, wind-parallel. Carved. Barchan: Crescent dune, horns downwind. Built. Deflation: Wind lifting and removing loose particles from a surface. Saltation: Grains hopping in the near-surface wind. Suspension: Fine dust carried high. Dust Bowl black blizzards. Nabkha: Sand trapped at a plant. Vegetation as roughness. Erg: A sand sea. Needs a sand supply. Not every desert.

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

Without the 3D view: yardangs are carved, barchans are built, horns point downwind. Aeolian work needs loose sediment, wind, and often thin vegetation. Many deserts are rock and pavement; dunes need a sand supply. Dust Bowl was land use plus drought plus wind, not a dune-sea poster. Vertical exaggeration is ×8 and labelled. This is a process, not a homepage special effect. Grand Canyon dryland is rock and pavement as much as sand. Horns are not a compass. Carved versus built. Say the pair. Vegetation is roughness.

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 dunes; NOAA Dust Bowl.

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 (A-level; NGSS MS-ESS2-2) are filters, not a flag. A class in Nairobi, London, or Shanghai can use the same 3D. Ages (GCSE, A-level, NGSS MS) 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: Yardangs are carved. Barchans are built. Wind is a sculptor where vegetation is thin. Two: the misconception “All deserts are dune seas.”. 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 t, labels, true scale. Send them home with the same link; there is no login.

In-site film

How Does the Earth Create Different Landforms? Crash Course Geography #19. Crash Course Geography. Crash Course / Complexly on YouTube. Standard YouTube licence. Educational embed, autoplay off. Autoplay off.