Domain: Natural Science — Marine Science
Target concept: Paraffin wax is injected through a pipeline underwater to simulate lava eruption.

Video generation prompt: In a clear tank, a submerged pipe continuously injects molten wax into cold water, simulating the eruption of underwater lava.

Evaluation guide:
(i) Target concept: Underwater lava emplacement via rapid conductive cooling of extruded viscous melt.
Minimum mechanism: Wax must be molten at injection, water must be cold relative to wax's melting point, the pipe outlet must stay submerged so the melt contacts cold water immediately on exit (preventing premature air-cooling or a surface skin from forming), and rapid conductive quenching at the wax-water interface must drive the solidification that produces branching filaments.
(ii)Storyline: [Frame 0–2] Clear tank filled with still water; submerged pipe visible, outlet centered. → [Frame 3–5] Molten wax (yellow-orange, translucent) begins continuous extrusion from pipe outlet. → [Frame 6–8] Wax contacts cold water, rapidly solidifies into white, branching filaments that extend radially while remaining attached at origin. → [Frame 9–10] Filaments retain shape, show no melting or collapse, and exhibit increasing opacity toward tips. Perspective: Fixed frontal view, full tank in frame, no obstructions, water surface visible but not dominant.

Manual:
Experimental Procedure
1. Fill a clear rectangular acrylic tank with cold water.
2. Submerge a narrow metal pipe vertically, with its open end 2–3 cm below water surface.
3. Inject molten paraffin wax (heated to ~70°C) steadily through the pipe into the water.
Observation of Experimental Phenomena
Wax emerges as a viscous yellow-orange stream, instantly cools upon water contact, solidifying into thin, flexible, branching white filaments that grow outward from the pipe outlet while remaining anchored.
Summary of Experimental Principles
Paraffin wax simulates basaltic lava: high viscosity and rapid conductive cooling in water produce filamentous structures analogous to pillow lavas formed at mid-ocean ridges.

Prompt Grounding rubric:
level_1: None of the required objects appear: no submerged pipe, no clear tank, and no wax material are visible; the underwater setting itself is not established.
level_2: At least one core object appears (e.g., the tank or the pipe), but no injection action occurs: the wax is absent or static, there is no sign of submersion (no water surface, bubbles, or refraction visible), and the tank, pipe, and wax do not appear together in a coherent sequence.
level_3: The clear tank, the submerged pipe positioned correctly inside it, and molten wax visibly present at the pipe outlet are all shown together; the pipe is shown injecting wax as a continuous extrusion into the water, with all three objects spatially coherent in the same shot.
level_4: The scene meets the 3-point description, and in addition the wax emerges only from the pipe outlet with no wax appearing from any other source, the pipe stays fully submerged for the whole clip with no part breaching the water surface, and the tank walls stay clear and unobstructed.
level_5: The scene meets the 4-point description, and in addition the pipe outlet sits centered in frame and is clearly visible, the wax extrudes continuously with no visible interruption, the tank contains only water with no floating debris, labels, or other additives, and no visual artifact obscures the pipe-wax-water contact point.

Scientific and Causal Correctness rubric:
level_1: The wax looks solid or granular right at extrusion rather than molten, with no visible thermal-state change; it spreads like loose sediment or appears to dissolve instead of forming strands; no filament or branching structure forms; its color contradicts molten wax (e.g., it reads as blue, green, or opaque black).
level_2: The wax looks liquid but behaves in a physically impossible way: it solidifies instantly on contact with no visible cooling transition, forms spherical droplets instead of a cohesive strand, changes color abruptly partway through extrusion, or visibly flows upward against gravity.
level_3: The molten wax, yellowish-orange, translucent, and visibly viscous, emerges from the pipe and begins cooling in the water, forming thin, flexible, branching filaments that solidify while keeping their shape; color and texture read as paraffin wax moving from molten to solid.
level_4: The filaments meet the 3-point description, and in addition they visibly form only once the wax contacts the cold water, with no solidification visible while still inside the pipe; branching progresses outward along each filament away from the outlet rather than appearing all at once along its length; and no filament re-melts or re-liquefies after it has solidified.
level_5: The filaments meet the 4-point description, and in addition every visible filament stays connected from the pipe outlet to its tip with no segment detaching or floating free before it has fully solidified, and the color shift from translucent to milky-white happens evenly across all filaments rather than patchily or in streaks.

Spatiotemporal Consistency rubric:
level_1: The pipe jumps to a different position between frames; wax appears or disappears with no visible path connecting its positions; the tank's shape warps or flips; the lighting shifts violently (e.g., a bright frame is immediately followed by a dark one); the water surface flickers or vanishes intermittently.
level_2: The pipe's position visibly drifts across frames with no apparent physical cause; wax extrusion starts or stops abruptly with no easing; the water surface's reflection pattern changes character with no smooth transition; shadows on the tank walls jump to a different position or invert with no visible change in a light source.
level_3: The pipe stays fixed in place relative to the tank; the wax extrudes with continuous, unbroken motion from the outlet; the water surface stays level and stable; the lighting's direction and brightness stay visibly steady across the clip; the tank and pipe show no structural distortion; no object's position relative to the others visibly shifts.
level_4: Motion meets the 3-point description, and in addition the wax visibly slows near the filament tips in a way consistent with a viscous fluid rather than extending like a rigid rod, no frame shows visible tearing or ghosting of the wax or pipe, and any surface ripples spread outward from the extrusion point in a consistent pattern.
level_5: Motion meets the 4-point description, and in addition the inter-frame motion reads as smooth throughout with no visible stutter or sudden speed change, the water line where it meets the pipe keeps a consistent curved shape, and the pipe in the foreground and the tank walls in the background show no visible shift in their relative alignment as the camera holds its position.