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HS06 · CUMULATIVE PRACTICE

Connect Environmental evidence

Work across six domains: trace resources, compare interventions, calculate with units and challenge a conclusion.

These 12 public cases sample all six environmental-course domains. Each asks for a numerical response or evidence choice and a written explanation. Original stipulated scenarios are identified in their prompts; historical observations retain their source context. Explain the assumptions, an alternative and the evidence that could change your conclusion.

Record your reasoning before submitting. The first numerical or choice response stays recorded; explanation drafts remain editable and are not a locked first-attempt record. Feedback and keys are public in this static application. Three attempts per case support practice, not a secure examination or independently demonstrated understanding.

0/12 cases attempted; 0/12 first responses match the public keys. Unattempted cases provide no evidence. Neither count changes lesson completion or awards course mastery. Repeated or imported exposure remains known.

Compare detected richness

In the fictional habitat map, three edge quadrats detect 1 taxon. Three spread quadrats detect 3 taxa. How many additional taxa does the spread sample detect?

Response for Compare detected richness (taxa) Your reasoning for Compare detected richness

Include your reasoning before recording a response. Explain the mechanism, evidence and assumptions. This saved draft stays editable after feedback; it is not a locked first-attempt explanation and is not automatically graded.

Responses cannot be saved while storage is loading, unavailable or conflicted. Resolve storage before continuing.

Record response for Compare detected richness

0/3 attempts recorded. No recorded feedback exposure in this notebook.

Challenge a disturbance claim

A before/after richness comparison also changes season and sampling effort. Which inference is supported?

Your response

The disturbance is proven to cause the change.Differences in detection have been ruled out.The causal effect remains unresolved; retain comparable effort, timing and comparison evidence.

Your reasoning for Challenge a disturbance claim

Include your reasoning before recording a response. Explain the mechanism, evidence and assumptions. This saved draft stays editable after feedback; it is not a locked first-attempt explanation and is not automatically graded.

Responses cannot be saved while storage is loading, unavailable or conflicted. Resolve storage before continuing.

Record response for Challenge a disturbance claim

0/3 attempts recorded. No recorded feedback exposure in this notebook.

Balance nitrogen across a plot

A supplied plot starts with 100 kg N, receives 4 kg N by fixation and 10 kg N as fertilizer, and exports 6 kg N in water, 4 kg N in gas and 8 kg N in harvest. What is its final total?

Boundary or step	Supplied evidence
Initial store	100 kg N
External inputs	4 fixation + 10 fertilizer kg N
External outputs	6 water + 4 gas + 8 harvest kg N
Final store	Find the remaining total

The order and boundary are part of the problem. A request or missing observation is not an observed physical transfer.

Response for Balance nitrogen across a plot (kg N) Your reasoning for Balance nitrogen across a plot

Include your reasoning before recording a response. Explain the mechanism, evidence and assumptions. This saved draft stays editable after feedback; it is not a locked first-attempt explanation and is not automatically graded.

Responses cannot be saved while storage is loading, unavailable or conflicted. Resolve storage before continuing.

Record response for Balance nitrogen across a plot

0/3 attempts recorded. No recorded feedback exposure in this notebook.

Distinguish matter and energy

Which statement respects the different matter and energy accounts?

Your response

Usable energy recycles indefinitely like atoms.Atoms can recycle while energy transfers require input and energy disperses.One plant carbon budget equals the entire global carbon cycle.

Your reasoning for Distinguish matter and energy

Include your reasoning before recording a response. Explain the mechanism, evidence and assumptions. This saved draft stays editable after feedback; it is not a locked first-attempt explanation and is not automatically graded.

Responses cannot be saved while storage is loading, unavailable or conflicted. Resolve storage before continuing.

Record response for Distinguish matter and energy

0/3 attempts recorded. No recorded feedback exposure in this notebook.

Separate unmet requests from water

The fictional seven-day dry case with requested release 5 m³/day requests 140 m³ of service but delivers 40 m³. How much service is unmet?

Boundary or step	Supplied evidence
Initial store + inflow	40 + 35 m³
Actual release + service	35 + 40 m³
Final store and spill	0 m³ each
Requested service	140 m³

The order and boundary are part of the problem. A request or missing observation is not an observed physical transfer.

Response for Separate unmet requests from water (m³) Your reasoning for Separate unmet requests from water

Include your reasoning before recording a response. Explain the mechanism, evidence and assumptions. This saved draft stays editable after feedback; it is not a locked first-attempt explanation and is not automatically graded.

Responses cannot be saved while storage is loading, unavailable or conflicted. Resolve storage before continuing.

Record response for Separate unmet requests from water

0/3 attempts recorded. No recorded feedback exposure in this notebook.

Test conditional land output

An expanded original land plan has conditional food output 24 t requiring 1200 m³ irrigation; the water budget is 1000 m³. Which conclusion follows?

Your response

The plan guarantees 24 t of actual production.Proportional reduction proves actual production will be 20 t.The water requirement exceeds the budget by 200 m³; actual yield is unresolved.

Your reasoning for Test conditional land output

Include your reasoning before recording a response. Explain the mechanism, evidence and assumptions. This saved draft stays editable after feedback; it is not a locked first-attempt explanation and is not automatically graded.

Responses cannot be saved while storage is loading, unavailable or conflicted. Resolve storage before continuing.

Record response for Test conditional land output

0/3 attempts recorded. No recorded feedback exposure in this notebook.

Account for discharge conversion

A full 4 kWh internal store discharges at 75% efficiency with adequate output power and demand. How much energy is delivered?

Response for Account for discharge conversion (kWh) Your reasoning for Account for discharge conversion

Include your reasoning before recording a response. Explain the mechanism, evidence and assumptions. This saved draft stays editable after feedback; it is not a locked first-attempt explanation and is not automatically graded.

Responses cannot be saved while storage is loading, unavailable or conflicted. Resolve storage before continuing.

Record response for Account for discharge conversion

0/3 attempts recorded. No recorded feedback exposure in this notebook.

Find a matched-service crossing

For equal delivered service L in kWh, original lifecycle totals are A = 20 + 0.4L and B = 80 + 0.1L kg CO2e. At what L do they match?

Response for Find a matched-service crossing (kWh) Your reasoning for Find a matched-service crossing

Include your reasoning before recording a response. Explain the mechanism, evidence and assumptions. This saved draft stays editable after feedback; it is not a locked first-attempt explanation and is not automatically graded.

Responses cannot be saved while storage is loading, unavailable or conflicted. Resolve storage before continuing.

Record response for Find a matched-service crossing

0/3 attempts recorded. No recorded feedback exposure in this notebook.

Apply the fate steps in order

A hypothetical 40 g parent pollutant first exports 25%, then transforms 25% of the remaining parent. How much parent remains?

Boundary or step	Supplied evidence
Start	40 g parent
First step	Export 25% of starting parent
Second step	Transform 25% of the remaining parent
Account separately	Retained, exported, transformed-parent equivalent

The order and boundary are part of the problem. A request or missing observation is not an observed physical transfer.

Response for Apply the fate steps in order (g) Your reasoning for Apply the fate steps in order

Include your reasoning before recording a response. Explain the mechanism, evidence and assumptions. This saved draft stays editable after feedback; it is not a locked first-attempt explanation and is not automatically graded.

Responses cannot be saved while storage is loading, unavailable or conflicted. Resolve storage before continuing.

Record response for Apply the fate steps in order

0/3 attempts recorded. No recorded feedback exposure in this notebook.

Retain an observational gap

The frozen USGS site 01646500 record has daily mean specific conductance 284 µS/cm at 25°C on January 4, 2024; January 5 is absent. What is January 5 minus January 4?

Boundary or step	Supplied evidence
January 4, 2024	284 µS/cm at 25°C
January 5, 2024	Absent observation; not zero

The order and boundary are part of the problem. A request or missing observation is not an observed physical transfer.

Your response

−284 µS/cm at 25°CUnavailable because the January 5 observation is absentZero µS/cm at 25°C

Your reasoning for Retain an observational gap

Include your reasoning before recording a response. Explain the mechanism, evidence and assumptions. This saved draft stays editable after feedback; it is not a locked first-attempt explanation and is not automatically graded.

Responses cannot be saved while storage is loading, unavailable or conflicted. Resolve storage before continuing.

Record response for Retain an observational gap

0/3 attempts recorded. No recorded feedback exposure in this notebook.

Use delivered service in the ratio

The original disrupted transport packet emits 60 kg scenario operational CO2e while serving 600 passenger-km and leaving 600 passenger-km unmet. What is the intensity per served passenger-km?

Response for Use delivered service in the ratio (kg CO2e/passenger-km) Your reasoning for Use delivered service in the ratio

Include your reasoning before recording a response. Explain the mechanism, evidence and assumptions. This saved draft stays editable after feedback; it is not a locked first-attempt explanation and is not automatically graded.

Responses cannot be saved while storage is loading, unavailable or conflicted. Resolve storage before continuing.

Record response for Use delivered service in the ratio

0/3 attempts recorded. No recorded feedback exposure in this notebook.

Limit a shade-plan claim

A shade plan reduces local heat exposure under monitored conditions; no emissions inventory is supplied. Which claim is supported?

Your response

A supported adaptation mechanism; mitigation needs separate evidence.The plan has reversed global warming.Every neighborhood benefits equally.

Your reasoning for Limit a shade-plan claim

Include your reasoning before recording a response. Explain the mechanism, evidence and assumptions. This saved draft stays editable after feedback; it is not a locked first-attempt explanation and is not automatically graded.

Responses cannot be saved while storage is loading, unavailable or conflicted. Resolve storage before continuing.

Record response for Limit a shade-plan claim

0/3 attempts recorded. No recorded feedback exposure in this notebook.

Bring the reasoning to review

A reviewer should check your calculations, evidence integrity, model assumptions and alternatives across these domains, then assign an unfamiliar task and review your project revision. Correct public responses alone do not establish practical technique or independent investigation.

Prepare the cumulative evidence brief

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