Domain: Natural Science — Geology & Geophysics
Target concept: Mid-ocean ridge analogy: Heated wax rises and spreads beneath the water layer.

Video generation prompt: A transparent glass container with colored wax at the bottom, covered by a layer of water, and heated from below at the center.

Evaluation guide:
(i) Target concept: Thermal convection-driven vertical uplift followed by lateral spreading of a less-dense, heated viscoelastic material beneath a denser overlying fluid.
Minimum mechanism: Wax must be initially solid and immobile; heating must induce localized viscosity reduction; buoyancy must drive vertical ascent; interface breach must precede horizontal expansion; water motion must be a passive, synchronous response to wax displacement.
(ii)Storyline: [Phase 1] Static start: container visible, wax solid and flat at bottom, water layer still and continuous above. [Phase 2] Onset: wax softens centrally, begins upward bulging with visible surface deformation. [Phase 3] Breach: wax plume penetrates water interface, creating localized upward water displacement. [Phase 4] Spread: wax expands radially beneath water surface, forming thin horizontal layer. [Phase 5] Response: water surface develops symmetric outward motion (ripples or deflection) concurrent with lateral wax expansion. All phases must occur in strict sequence from fixed frontal viewpoint; wax and water must remain fully within frame; no occlusion of bottom wax or heater region.

Manual:
Experimental Procedure
1. Place solid colored wax at bottom of transparent glass container.
2. Carefully pour water to fully cover wax layer.
3. Heat container uniformly from center-bottom.
Observation of Experimental Phenomena
Wax softens and rises vertically as a plume from center-bottom, breaches water interface, then spreads horizontally beneath water surface; water above responds with outward surface motion.
Summary of Experimental Principles
Mid-ocean ridge analogy: Heated wax rises and spreads beneath the water layer, modeling mantle upwelling and seafloor spreading.

Prompt Grounding rubric:
level_1: None of the four required elements is shown: no transparent glass container, no colored wax at the bottom, no water layer above the wax, and no heat source beneath the container.
level_2: Only one or two of the four elements (container, wax, water, heater) appear, or they appear in the wrong arrangement: e.g., the wax is not resting at the bottom, the water does not cover the wax, the heater is not positioned under the center of the container, or the container is not transparent.
level_3: All four elements appear in roughly the right arrangement (a transparent container, colored wax sitting at the bottom, a water layer covering the wax, and a heat source beneath the center), but at least one is visually unclear (e.g., the container looks more frosted than fully transparent, the wax's color barely stands out from the water, or there is no visible cue, such as shimmer or glow, that the heater is active).
level_4: Building on the 3-point description above, plus: the container's walls and contents are clearly see-through; the wax is a single solid-colored mass (e.g., red, yellow, or blue) that visibly contrasts with the water; the water layer is continuous and even, fully covering the wax; the heater shows a clear visual cue (shimmer, glow, or similar) directly beneath the center of the container, aside from one small flaw, such as the heater cue sitting slightly off-center or the wax's initial shape being a bit uneven without losing contact with the bottom.
level_5: Building on the 4-point description above, plus: the container is evenly transparent with no visible distortion of what's behind it; the wax fully covers the bottom of the container as one cohesive, high-contrast colored mass; the water layer is still, uniform, and has a sharp, clearly visible upper surface; the heater's shimmer or glow cue stays confined to the center-bottom region with no drift, so the setup reads unambiguously as container plus wax plus water plus centered heater with nothing out of place.

Scientific and Causal Correctness rubric:
level_1: No change occurs: the wax stays flat and solid at the bottom for the whole video, with no upward motion, no spreading, no deformation of the wax-water boundary, and no sign of movement in the water above it.
level_2: The wax shows only isolated surface bubbling or minor melting at its edges without ever rising as a connected mass; the water above stays fully still with no circulation; the wax-water boundary shows no interaction, and no lateral spreading of wax occurs.
level_3: The wax visibly softens and rises as a single column or plume from the center of the bottom, breaching the wax-water boundary; the water directly above shows a localized upward bulge or ripple where the wax breaks through, but the wax does not go on to spread sideways, and no horizontal sheet or ridge of wax forms afterward.
level_4: The wax rises as a defined plume from the center, breaches the boundary, and then spreads sideways beneath the water surface into a thin, continuous layer; the water above shows a gentle, roughly symmetric outward ripple or drift from the center, but the sideways spread doesn't reach the container walls, or the edge between wax and water stays a bit blurred or diffuse.
level_5: The wax rises from the exact center of the bottom as one unified plume; as soon as it breaches the water surface it spreads out radially into a thin, even, stable horizontal layer; the water above responds at essentially the same time with smooth, symmetric outward motion (concentric ripples or a uniform surface bulge); the whole rise-breach-spread-response sequence plays out in that order with no step out of place or visually ambiguous.

Spatiotemporal Consistency rubric:
level_1: Severe breaks in continuity: the container or the wax jumps to a different state between frames; the whole scene's brightness snaps from bright to black within a single frame; the water layer vanishes and reappears; the heater's glow flickers on and off with no buildup; the container visibly shatters or the wax breaks into floating pieces unrelated to the heating process.
level_2: Multiple moderate glitches: the wax's shape jumps discontinuously (e.g., straight from a flat blob to a full plume with no in-between stage); the water surface snaps from flat to rippled with no visible transition; the heater's glow appears at full strength instantly rather than building up; the camera's viewpoint on the container shifts abruptly, such as jumping from a front view to a top-down view partway through.
level_3: One clear flaw is present (for example, the wax plume appears with no visible softening stage beforehand, or the water surface starts moving before the wax has actually broken through, or the container's edge flickers intermittently), but otherwise the scene stays structurally intact and the camera viewpoint doesn't move.
level_4: Building on the 3-point description above, plus: the wax softens gradually, rises smoothly, breaches the water surface without a sudden jump, and spreads with a visibly changing speed; the water responds with a believable delay and keeps moving smoothly; the direction and brightness of the light on the scene stay the same throughout; the container's shape and transparency stay consistent across the video, aside from one small flaw, such as a faint, physically odd shimmer along the container's edge.
level_5: Building on the 4-point description above, plus: the wax's transition from solid to rising plume to spreading fluid looks completely uninterrupted; the water's surface deforms in step with the wax breaching it, neither too early nor too late; the lighting, refraction, and transparency effects stay stable and geometrically consistent throughout; the container keeps a fixed, undistorted outline; aside from the heater's expected shimmer/glow cue staying confined to the center-bottom region, nothing else in the video flickers, warps, or looks like a frame-interpolation artifact.