Domain: Humanities and Social Sciences — Geography
Target concept: Basin Characteristics: Amazon Basin (dendritic drainage system, satellite line networks) and Congo Basin (centripetal drainage system, satellite centripetal lines)

Video generation prompt: First, present the satellite image of the Amazon Basin drainage system to observe its morphological characteristics. Then, present the satellite image of the Congo Basin drainage system to compare their morphology. Focus the visual emphasis on the satellite images, highlighting the shapes of the lines in the satellite images of the two drainage systems.

Evaluation guide:
(i) Target concept: Visual discrimination of fluvial network morphology (dendritic vs. centripetal) from authentic satellite-derived imagery.
Minimum mechanism: Satellite imagery must preserve topologically valid, geometrically coherent drainage line representations derived from real-world elevation and hydrology; labels must be unambiguously bound to correct basin; side-by-side comparison requires strict spatial registration to enable direct morphological contrast.
(ii)Storyline: Frame 1–3: Full-screen Amazon Basin satellite image with visible dendritic lines. Frame 4: Clean transition (cut or dissolve) initiating side-by-side layout. Frame 5–10: Stable, fixed-viewpoint side-by-side display: left panel (Amazon) shows outward-branching lines, right panel (Congo) shows inward-converging lines; both labeled; no motion, zoom, or rotation; lighting and contrast matched; drainage lines remain fully visible and structurally intact throughout.

Manual:
Experimental Procedure
1. Display satellite image of Amazon Basin with clear dendritic drainage lines.
2. Transition to side-by-side view: left panel = Amazon Basin (labeled), right panel = Congo Basin (labeled).
3. Both panels show high-resolution satellite imagery emphasizing drainage line morphology.
Observation of Experimental Phenomena
Amazon panel shows branching, tree-like (dendritic) line network radiating outward; Congo panel shows inward-converging (centripetal) line network focused toward central depression.
Summary of Experimental Principles
Amazon Basin features dendritic drainage due to uniform underlying geology and gentle slope; Congo Basin features centripetal drainage due to structural basin topography with central depression.

Prompt Grounding rubric:
level_1: No satellite image of either the Amazon Basin or the Congo Basin is shown; no drainage-line network of any kind appears; the video contains neither a single-basin image nor a two-basin comparison.
level_2: Only one basin's satellite image appears (Amazon alone or Congo alone) and the other basin is entirely absent; or drainage lines are too indistinct or blurred to identify as a river network; or the Congo image is shown before the Amazon image, reversing the required order.
level_3: Both the Amazon Basin and Congo Basin satellite images appear, Amazon first and Congo second, and each shows an identifiable network of drainage lines; however, the two images are never shown together in the same frame, e.g., they appear as fully separate segments with a blank or unrelated frame between them rather than as an adjacent two-panel view.
level_4: Both labeled satellite images (Amazon Basin, Congo Basin) appear in the correct order and are shown together, side by side, in the same frame at some point in the video; the branching pattern of the Amazon lines and the converging pattern of the Congo lines are each visible; both required panels and the transition into the paired view are present with nothing missing.
level_5: All conditions of the 4-point level are met, and the side-by-side pairing holds a fixed viewpoint for its full duration with no zooming, panning, or rotating of either panel; the "Amazon Basin" and "Congo Basin" labels stay attached to their correct panel and remain readable for the entire comparison segment, with no panel becoming occluded or losing its label.

Scientific and Causal Correctness rubric:
level_1: The drainage-line pattern contradicts real basin morphology: e.g., the Amazon panel shows inward-converging lines, or the Congo panel shows outward-branching lines, or both panels show the same pattern, or the lines shown are non-hydrological shapes (perfect circles, grids, abstract fractal art) rather than plausible river networks.
level_2: One basin's pattern is scientifically correct (e.g., Amazon shown branching outward) but the other is wrong (e.g., Congo also shown branching outward instead of converging toward a central low area); or the imagery is so blurred, over-stylized, or noisy that a viewer cannot tell whether the lines converge or diverge.
level_3: The two panels show visibly distinct patterns (one branching outward, one converging inward), but the labels are swapped (the converging pattern is labeled "Amazon" and the branching pattern is labeled "Congo"), or no labels appear at all so the correct pattern cannot be attributed to the correct basin.
level_4: The Amazon panel correctly shows a branching, tree-like network of tributaries spreading outward, and the Congo panel correctly shows channels converging inward toward a central low-lying area; the labels match the correct panel; nothing implies water flowing in a direction that contradicts the shown network (e.g., no animated flow arrows pointing the wrong way).
level_5: All conditions of the 4-point level are met, and the Amazon's branching network reads as a continuous hierarchy of tributaries joining larger channels (no tributary appears as an isolated, unconnected segment), and the Congo's converging network reads as channels feeding into a single central region with no stray channel visibly running outward and breaking the converging pattern.

Spatiotemporal Consistency rubric:
level_1: The video cuts from the Amazon image directly to the Congo image with no visible transition; the same basin image reappears later at a different size, crop, or orientation with no visible motion explaining it; the screen goes fully dark mid-sequence; a drainage-line network visibly flickers or disappears partway through the video; or the overall lighting/brightness shifts abruptly between frames with no visible cause, not just a fade to black.
level_2: The transition into the side-by-side view includes a distracting full black flash lasting noticeably longer than a quick cut or dissolve; or one panel visibly zooms, rotates, or changes scale while the other stays fixed, breaking the shared fixed-viewpoint framing; or the brightness or contrast of one panel visibly changes partway through the comparison while the other does not, with no stated reason.
level_3: A brief cut or dissolve carries the video from the Amazon-only view into the side-by-side view, preserving the correct order and without a distracting black flash; however, once side by side, the two panels are not obviously matched in brightness or sharpness: a viewer can notice, without pausing or zooming in, that one panel looks dimmer, softer, or has a visibly rougher or more broken-up border than the other.
level_4: The transition into the side-by-side layout is a single clean cut or dissolve with no black flash and no flicker; once paired, the two panels keep the same scale, orientation, and aspect ratio as each other for the whole comparison; brightness, contrast, and sharpness look matched between the two panels to a casual viewer.
level_5: All conditions of the 4-point level are met, and neither panel visibly drifts, shifts, or wobbles in position at any point during the side-by-side segment (no shift perceptible without frame-by-frame comparison); there is no visible motion blur on either satellite image, which should look crisp and still throughout; the video shows no visible stutter, freeze, or repeated/skipped frame that a viewer would notice as a hitch in playback.