This packet is everything a parent or guide needs to assess Unit 01 at home — the learning targets, the answers that count as correct, the mastery rubric, calibration examples, and a clipboard score sheet. No multiple-choice test: the student shows mastery by running the water-property investigation and reasoning from ocean measurements aloud.
By the end of the Ocean Environment unit, a student should be able to:
Six criteria, each judged Not yet / Approaching / Mastered (Page 3).
Salinity, temperature, and density measured — recorded live.
The student reasons from ocean measurements aloud (Page 4 anchors).
Contemporaneous record of salinity, temperature, and density readings.
You are making a decision, not adding up points. For each criterion, decide whether the work is Not yet, Approaching, or Mastered — the column language tells you which. A criterion counts as mastered only when the student can both run the technique and justify the ocean physics behind it. A student carries three tokens per term; one token buys a re-do of one criterion on another day, so a single bad afternoon never sinks the unit.
Accept any answer in the synonyms column — they are pre-approved as equivalent. The third column flags the confusions that look close but are not yet, so you can coach precisely.
| Canonical answer | Accepted synonyms | Common confusion / discriminator |
|---|---|---|
| Ocean zones & structure | ||
| Pelagic zone | open-water column | The open water itself — contrast with benthic, the bottom |
| Benthic zone | seafloor habitat | The bottom and what lives on it, not the open water above |
| Euphotic zone | sunlit zone | Enough light for photosynthesis; roughly the top ~200 m |
| Intertidal zone | littoral / shoreline | Exposed and covered by the tides, not the deep abyssal floor |
| Seawater properties | ||
| Salinity | dissolved-salt content; ppt / PSU | Sets density; measured with a hydrometer or refractometer |
| Density | mass per volume | Rises with salinity and cold; drives sinking and stratification |
| Thermocline | temperature transition layer | A rapid temperature drop with depth, not a gradual one |
| Stratification | layering by density | Denser water sits below; layers resist mixing |
| Depth & circulation | ||
| Pressure | hydrostatic pressure | Rises about one atmosphere for every 10 m of depth |
| Light attenuation | light fading with depth | Light runs out with depth; none for photosynthesis below the euphotic zone |
| Surface currents | wind-driven currents | Driven by wind at the surface; move heat around the planet |
| Thermohaline circulation | density-driven deep circulation | Cold, salty water sinks and drives the deep conveyor; upwelling returns it |
| Criterion | Not yet | Approaching | Mastered |
|---|---|---|---|
| Ocean zones & structure | Pictures the ocean as one uniform body of water. | Names the sunlit, twilight, and midnight zones but confuses pelagic and benthic. | Maps the vertical zones by light and depth and distinguishes pelagic from benthic, intertidal from abyssal. |
| Salinity & seawater properties | Thinks seawater is just “water with salt.” | Defines salinity but cannot connect it to density or measurement. | Explains salinity, relates it to density and stratification, and reads a hydrometer or refractometer. |
| Depth: temperature, pressure & light | Assumes the ocean is the same top to bottom. | Knows conditions change with depth but not the pattern. | Describes the thermocline, the ~1 atmosphere-per-10 m pressure rise, and light attenuation, and predicts conditions at depth. |
| Currents & circulation | Believes ocean water sits still. | Names surface currents but not what drives them. | Distinguishes wind-driven surface currents from density-driven thermohaline circulation and explains upwelling. |
| Lab technique (water-property investigation) | Skips readings or records them without units. | Takes measurements but is careless with the salinity or temperature tools. | Runs a clean water-property investigation — salinity, temperature, and density measured, recorded with units, and interpreted. |
| Integration (cross-domain) | Treats the science as isolated facts. | Names a link to history, reading, or writing but cannot defend it. | Connects the unit across History · Reading · Writing and defends why it matters. |
Work down the criteria one at a time. Ask the student to reason it out rather than recall — “why does the deep water sink?” The cause (cold, salty water is denser) is where Approaching and Mastered separate. Reading a value is Approaching; explaining why the ocean behaves that way is Mastered.
Read these before you grade. They show what Mastered and Not yet actually sound like, plus the edge cases where you should coach rather than decide on the spot.
Student: ______________________________________ Date: _______________ Guide: _________________________
| # | Criterion | Decision | Notes |
|---|---|---|---|
| 1 | Ocean zones & structure | NY / Appr / Mast | |
| 2 | Salinity & seawater properties | NY / Appr / Mast | |
| 3 | Depth: temperature, pressure & light | NY / Appr / Mast | |
| 4 | Currents & circulation | NY / Appr / Mast | |
| 5 | Lab technique (water-property investigation) | NY / Appr / Mast | |
| 6 | Integration (cross-domain) | NY / Appr / Mast |
☐ No ☐ Yes — for criterion: __________ Tokens remaining: ☐ 3 ☐ 2 ☐ 1 ☐ 0
NY = Not yet · Appr = Approaching · Mast = Mastered · Unsure between two levels? Circle the lower one and note what a re-do would need.