Domain: Natural Science — Geology & Geophysics
Target concept: Quartz Crystal vs. Salt Crystal in Water (Insoluble vs. Rapidly Soluble)

Video generation prompt: Two identical transparent beakers are placed side by side, each containing water. A transparent quartz crystal is placed into the left beaker, and a white halite crystal is placed into the right beaker, after which the setup is left undisturbed.

Evaluation guide:
(i) Target concept: Differential solubility of minerals in water as determined by crystal lattice energy and hydration energy balance.
Minimum mechanism: Halite"s ionic lattice is readily disrupted by water molecules due to strong ion-dipole interactions, enabling rapid dissociation; quartz"s covalent network lattice requires far greater energy input to break, making it effectively insoluble under ambient aqueous conditions.
(ii)Storyline: Frame 0–2: Static wide shot showing two empty beakers placed side-by-side. Frame 3–4: Beakers filled with water (clear, level meniscus). Frame 5–6: Quartz crystal enters frame from top and settles in left beaker. Frame 7–8: Halite crystal enters frame from top and settles in right beaker. Frame 9–10+: Continuous stillness phase, halite visibly erodes at edges/corners while quartz retains sharp facets; no motion, no agitation, no external interference; fixed orthogonal viewpoint ensures unambiguous left/right comparison and direct visual contrast of dissolution outcomes.

Manual:
Experimental Procedure
1. Place two identical transparent beakers side-by-side on a flat surface.
2. Fill both beakers with equal volumes of clear water.
3. Place one transparent quartz crystal into the left beaker.
4. Place one white halite crystal into the right beaker.
5. Leave setup undisturbed for observation.
Observation of Experimental Phenomena
The halite crystal in the right beaker gradually decreases in size and loses sharp edges; the quartz crystal in the left beaker remains unchanged in size, shape, and transparency; water remains clear in both beakers.
Summary of Experimental Principles
Quartz is insoluble in water and resists dissolution; halite (rock salt) is rapidly soluble in water and undergoes visible dissolution when immersed.

Prompt Grounding rubric:
level_1: No side-by-side beakers are shown; or one or both beakers contain no water; or the quartz crystal is missing from the left beaker; or the halite crystal is missing from the right beaker; or the crystals are not transparent (quartz) and white (halite) respectively; or more than two beakers appear; or both crystals are dropped in at the same instant with no clear left/right assignment.
level_2: Two beaker-like vessels with water are shown, but at least one crystal is missing, swapped (e.g., the quartz crystal placed in the right beaker instead of the left), or rendered with the wrong look (e.g., the quartz crystal appears opaque, or the halite crystal appears colored instead of white); or the two beakers are not clearly arranged side by side (overlapping, angled, or one partly hidden behind the other).
level_3: Two matching transparent beakers stand side by side, each filled with clear water; a transparent quartz crystal rests fully visible in the left beaker; a white halite crystal rests fully visible in the right beaker; no unrelated objects appear in the shot; which beaker is left and which is right is clear from position alone.
level_4: Everything required at the 3-point level is present, and in addition: both crystals sit on the bottom of their beakers rather than floating or hovering mid-water; the two beakers stay put for the whole shot; no hand or tool is visible placing the crystals; each crystal's arrival looks like a single settling motion (e.g., entering from above and coming to rest) rather than appearing already in place.
level_5: Everything required at the 4-point level is present, and in addition: the quartz crystal is placed into the left beaker first, and only after it settles does the halite crystal enter the right beaker, with the two placement motions never overlapping in time; both events happen in one unbroken shot with no cut, zoom, or repositioning of the camera between them; the camera keeps the same fixed, level view of both beakers throughout.

Scientific and Causal Correctness rubric:
level_1: No visible dissolution occurs in either beaker; or both crystals change in the same way (e.g., both appear to shrink, or both stay pristine); or the quartz crystal in the left beaker shows any visible loss of mass, faceting, or clarity (this reverses the real direction, since quartz is essentially insoluble); or either crystal visibly fragments, melts, or changes color, or the water turns cloudy (effects beyond simple edge erosion).
level_2: The correct direction of change appears but is weak or unconvincing: the halite crystal in the right beaker shows only a slight, hard-to-confirm change (e.g., a brief softening at one corner) while the quartz crystal stays visibly unchanged, but the erosion is too faint, brief, or inconsistent to read as clear dissolution; or the halite crystal disappears almost instantly (fully gone in under a second) rather than eroding gradually; or halite's eroded edge appears to partially regrow or sharpen again at some point.
level_3: The halite crystal in the right beaker shows clear, progressive shrinking or surface erosion (edges softening, corners rounding, or visible volume loss) during the still period; the quartz crystal in the left beaker shows no change in size, shape, or clarity; the water stays visually clear in both beakers.
level_4: Everything required at the 3-point level is present, and in addition: the contrast is visually unmistakable: the halite crystal shows continuous, directional mass loss (e.g., shrinking from the top down or eroding inward from an edge), while the quartz crystal keeps its sharp facets, outline, and clarity throughout; no stray bubbles, streaks, or ghost outlines appear around the quartz crystal.
level_5: Everything required at the 4-point level is present, and in addition: halite's dissolution happens with no stirring, bubbling, or visible water movement disturbing either beaker; the quartz crystal shows no flicker, shimmer, or distortion inconsistent with sitting undisturbed in still water; both crystals keep their original position and orientation on the beaker floor for the entire sequence.

Spatiotemporal Consistency rubric:
level_1: Severe breaks in continuity: one or both beakers vanish or shift to a new position between frames; the quartz or halite crystal appears or disappears with no visible path of motion into place; the water's surface snaps to a different level or shape from one frame to the next; the scene's lighting suddenly flashes, or the shadow's direction reverses, between frames; a beaker's round cross-section distorts into a different shape (e.g., oval or tapered) between frames.
level_2: Noticeable but less severe glitches: one beaker shifts sideways or rotates slightly partway through the video; a crystal's position changes with no visible path connecting the two positions; the water's meniscus wobbles erratically; background details flicker or stutter; the crystal-placement motion skips, with at least two missing in-between moments visible as a jump.
level_3: The two beakers keep the same position and orientation relative to each other for the whole video; both crystals sit stably on the bottom of their beakers without sliding around; the water's surface stays level and steady; neither crystal appears to clip through or hide unnaturally behind the glass; the direction and brightness of the light on the scene stay the same from start to finish.
level_4: Everything required at the 3-point level is present, and in addition: each crystal descends in a straight, steady downward path with no sideways drift or bounce; contact with the water's surface produces a brief ripple or dimple that settles quickly; neither crystal appears to pass through the beaker's bottom or float unnaturally above the water's surface.
level_5: Everything required at the 4-point level is present, and in addition: there is no frame repetition, no skipped frames, and no sudden change in playback speed anywhere in the video; the sequence from crystal entry to contact to settling to stillness flows without a single cut; the still period after both crystals have settled lasts long enough to clearly show halite's erosion rather than being cut short.