Moving homes, growing populations

GEO-12 · Geography · 25 minutes

Distinguish migration from daily mobility; calculate population change; read age structure without claiming more than the evidence shows.

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Diagnose · 0–5 minutes

Does traveling to school change your usual residence? Explain.
What four events can change a place's population?
Does seeing a new restaurant prove that its owner migrated? Explain.

Teach · 5–10 minutes

Think about the difference between moving homes and going to a store. Migration changes usual residence. A trip to school or a restaurant is daily mobility. A move within one country is internal migration. Leaving a country is emigration from the origin and immigration into the destination. Jobs can attract people; conflict can push people away, but a map alone does not prove why someone moved.

Population changes through births, deaths, immigration and emigration. The Census counted 308,745,538 US residents in 2010 and 331,449,281 in 2020. Subtract to find an increase of 22,703,743. Divide that increase by the 2010 count and multiply by 100: approximately 7.35%, or 7.4% rounded to one decimal. These dated counts are not today's population. Two totals alone do not reveal how much change came from each cause.

A population pyramid shows age groups on the vertical axis and population counts or shares on the horizontal axis, often split by sex. Compare the Census's actual 2010 and 2020 US diagrams: check axis units before comparing bar widths. More children can mean future demand for schools; more older adults can mean different service needs. Age is not a measure of an individual's dependence or ability. In demographic transition, death rates typically fall before birth rates, creating a period of faster natural increase; immigration also matters. Food, music and styles spreading between places are cultural diffusion. Social media can spread a style without a permanent move.

Practice · 10–15 minutes

Use the linked Census diagrams. Record the year, axis units and two age groups. Describe one visible difference, then write one question the chart cannot answer. Keep home addresses and household histories private.

Prove · 15–23 minutes

Use new questions without notes or hints. Record assistance honestly. All questions must be answered before checking.

1. Traveling from home to school each morning is usually: Internal migration Daily mobility International immigration

2. US population change from 2010 to 2020 was: 22,703,743 331,449,281 7,350,000

3. Growth percentage uses which denominator? The ending count The starting count The sum of both counts

4. In demographic transition, rapid natural increase commonly follows: Death rates falling while birth rates remain high Both rates reaching zero Emigration becoming impossible

5. A style spreading through online videos without people moving illustrates: Relocation diffusion only Expansion diffusion A population census

Explain why a bigger population does not by itself prove greater immigration. Use the real Census counts as evidence and name one additional record you would need. I completed the practice questions without hints or answer keys.

Correct · 23–25 minutes

For each missed answer, name the concept, show the evidence or calculation and explain why your first reasoning failed. Score alone does not authorize advancement.

Adult review and delayed check

Target: at least 4/5 practice questions plus an explanation earning at least 2/3 rubric points: accurate claim, relevant evidence, clear reasoning (one point each). An adult decides whether the explanation is acceptable. Repeat a different five-question check after 48–72 hours, independently, with at least 4/5. This ARKTIK instructional target is not an official AP standard.

Delayed check questions — use after 48–72 hours

A permanent move from one US state to another is:
- Internal migration
- Tourism
- International migration
People departing their origin country are counted there as:
- Immigrants
- Emigrants
- Commuters
Which expression describes population change?
- Births - deaths + immigration - emigration
- Births + deaths only
- Immigration + emigration only
A pyramid's broad younger-age bars directly show:
- Many people in those age groups
- A guaranteed future birth rate
- All young people are unemployed
To compare two population pyramids fairly, first check:
- The colors only
- Years and whether axes show counts or shares
- Which picture is larger

Adult coach answers are in the separate coach guide. Keep it closed during assessment.

Sources and scope

Original ARKTIK practice, prepared with AI assistance and checked for factual and scoring consistency. Review teacher materials for the current unit; these three missions are not a complete course or a completed TEKS alignment.