Week 5: Synthesis & Assessment
Grade 7 Science | Rosche
The Phenomenon: Synthesis & Assessment
Anchoring Context & Focus Question
How does Earth's internal heat drive all the surface processes we've studied this cycle?
Cycle 6 Concept Map: Earth's Dynamic Systems
This week, you'll show what you've mastered across our entire unit on plate tectonics. All four weeks connect into one unified picture — driven by a single source: Earth's internal heat.
| Week | Topic | Key Concept | Connection to Cycle |
|---|---|---|---|
| W1 | Plate Boundaries | 3 boundary types; earthquake & volcano patterns | Plates move because of mantle convection (W4 heat source) |
| W2 | Seafloor Spreading | Magnetic stripes, Pangaea evidence, continental drift | New crust forms at divergent boundaries (W1); seafloor spreading proves plate movement |
| W3 | Volcanic Eruptions | Magma viscosity, eruption styles, volcanic hazards | Volcanoes form at convergent and divergent boundaries (W1); magma originates in mantle (W4) |
| W4 | Earth's Interior | Seismic waves (P & S), shadow zones, 4 layers | Internal heat drives convection → plate motion → all surface processes (W1–W3) |
The Big Arrow: Earth's Core Heat → Mantle Convection → Plate Movement → Earthquakes, Volcanoes, Mountains
Stop & Think Before We Begin
Without looking at your notes, can you name the three types of plate boundaries AND one geological feature each one creates? If you can, you're ready for today's assessment.
This Week's Learning Goals (Assessment Focus)
- Demonstrate mastery of plate boundaries, seafloor spreading, volcanic systems, and Earth's interior.
- Construct evidence-based explanations connecting multiple weeks of content.
- Identify and correct the three major cycle misconceptions.
- Trace a complete causal chain from Earth's internal heat to surface phenomena.
Cognate Strategy: Many science words look similar in English and Spanish — use your Spanish to learn science!
| Term | Spanish | Definition |
|---|---|---|
| plate boundary | límite de placa | Where two tectonic plates meet; site of most earthquakes/volcanoes |
| convergent | convergente | A plate boundary where two plates move toward each other; creates mountains, trenches, or subduction |
| divergent | divergente | A plate boundary where two plates move apart; creates mid-ocean ridges and rift valleys |
| mantle | Layer between crust and core; solid but flows slowly; drives plate motion | |
| convection | convección | Heat-driven circulation in the mantle that moves tectonic plates |
| seismic waves | ondas sísmicas | Waves from earthquakes; P-waves and S-waves reveal Earth's interior |
| magma | magma | Molten rock beneath Earth's surface; erupts as lava |
Part 1 — Synthesis Review
Connect all four weeks of this cycle — trace the causal chain across the big ideas. (20 points, ~15 min)
Connect the Big Ideas: Synthesis Challenge
What You'll Do
- Recall the key concept from each of Weeks 1–4 without looking at notes
- Identify how each week's concept connects to at least one other week
- Trace the causal chain from Earth's internal heat to a surface phenomenon
- Predict which topics you feel most and least confident about before the assessment
Activate Prior Knowledge: What Do You Remember?
| Week | Topic | Key Evidence You Studied | One Vocab Word |
|---|---|---|---|
| W1 | Plate Boundaries | Earthquake & volcano distribution maps | Subduction, transform, divergent |
| W2 | Seafloor Spreading | Magnetic stripe symmetry, fossil distribution | Pangaea, mid-ocean ridge |
| W3 | Volcanic Eruptions | Magma viscosity data, volcanic hazard zones | Viscosity, lahar, pyroclastic |
| W4 | Earth's Interior | Seismic wave shadow zones, P- and S-wave paths | P-wave, S-wave, asthenosphere |
The Connection Challenge
Every week of Cycle 6 connects to every other week. For example: The heat from Earth's core (W4) drives mantle convection (W1), which spreads the seafloor (W2) and pushes magma into volcanoes (W3). What other connections can you find? Think about this before you open your form.
Stop & Think
Before submitting the hook form, write one sentence connecting two different weeks. Start with: "Without [concept from one week], we would not have [concept from another week] because..."
Worked Example – Writing an Evidence-Based Explanation Across Multiple Weeks
1
The Challenge: Multi-Week Evidence-Based Explanation
Scenario: Your teacher asks you to write an explanation tracing energy from Earth's core all the way to a volcanic eruption at the surface. You must use evidence from at least three different weeks of Cycle 6. How do you structure this?
Step-by-Step: Energy from Core to Eruption
Step 1: Start at the Source (W4 — Earth's Interior)
"Earth's core reaches ~6,000°C from radioactive decay and leftover heat from planet formation. This enormous heat causes the mantle to convect — hot rock rises, cools, and sinks in slow circulation cells."
Step 2: Connect to Plate Movement (W1 — Plate Boundaries)
"Mantle convection drags the lithospheric plates along the asthenosphere. Therefore, at divergent boundaries plates pull apart, and at convergent boundaries oceanic crust subducts beneath lighter continental crust."
Step 3: Trace the Volcanic Process (W3 — Volcanic Eruptions)
"As oceanic crust subducts, water released lowers the mantle melting point, which causes partial melting and magma formation. Low-silica magma (basaltic) erupts gently; high-silica magma (rhyolitic) erupts explosively. Evidence: magma viscosity data from W3 shows the silica–eruption style correlation."
Now YOU Complete the Final Step:
Step 4: How does seafloor spreading (W2) fit into this causal chain? Where does it connect — with core heat, plate movement, or volcanic activity? Write one sentence using "because," "therefore," or "which causes."
Fading Support: Steps 1–3 are modeled for you. Step 4 is YOUR turn — practice connecting W2 before you encounter similar questions in the assessment.
Station 1 – Synthesis Review
Connect concepts across all four weeks of Cycle 6.
Your Mission: Synthesis Review (20 pts — 15 min)
Before the main assessment, demonstrate how all four weeks of Cycle 6 connect. For each week, identify the key concept, the evidence that supports it, and how it links to at least one other week.
Concept Connection Table — Fill This In (use the form)
| Week | Key Concept | Evidence Supporting It | Connection to Another Week |
|---|---|---|---|
| Week 1 Plate Boundaries | Divergent, convergent, transform boundaries create different geological features | Global earthquake & volcano distribution maps cluster at boundary lines | Plate boundaries are where W3 volcanoes form; driven by W4 convection |
| Week 2 Seafloor Spreading | New oceanic crust forms at mid-ocean ridges; continents once joined as Pangaea | Symmetric magnetic stripes; matching fossils on separate continents; seafloor age gradient | Seafloor spreading = divergent boundary (W1); subducted crust melts into W3 magma |
| Week 3 Volcanic Eruptions | High-silica magma = explosive eruptions; low-silica = effusive; volcanoes cluster at boundaries | Viscosity data, Ring of Fire volcano locations, lahar/pyroclastic flow records | Requires W1 convergent boundaries; magma originates in W4 mantle; water from subducted W2 crust triggers melting |
| Week 4 Earth's Interior | 4 layers (crust, mantle, outer core, inner core); outer core is liquid; mantle is solid but flows | S-wave shadow zone proves liquid outer core; P-wave refraction reveals layer boundaries | Core heat drives mantle convection → moves W1 plates → spreads W2 seafloor → erupts W3 volcanoes |
The table above shows model answers — use it to self-check AFTER completing the form. Your form responses are what gets scored.
Stop & Think: The Big Integration Question
Q5 on the form asks: Describe the complete chain of cause and effect from Earth's internal heat to surface earthquakes. Include convection, plate movement, stress buildup, and energy release. This is worth 4 points — take your time.
Station 2 – Cumulative Assessment
Demonstrate mastery across all four weeks of Cycle 6.
Cumulative Assessment (60 pts — 40 min)
This is the main assessment for Cycle 6. It has four sections — each covering one week of content. Read every question carefully, cite evidence, and use complete sentences for open-response questions.
Assessment Structure: 4 Sections × 15 Points Each
| Section | Topic (from Week) | Points | Suggested Time |
|---|---|---|---|
| Section A | Plate Boundaries (Week 1): divergent, convergent, transform; earthquake patterns | 15 pts | ~10 min |
| Section B | Seafloor Evidence (Week 2): magnetic stripes, Pangaea evidence, seafloor age | 15 pts | ~10 min |
| Section C | Volcanic Systems (Week 3): magma viscosity, eruption styles, hazards, hot spots | 15 pts | ~10 min |
| Section D | Earth's Interior (Week 4): P-waves, S-waves, shadow zones, layer properties | 15 pts | ~10 min |
| TOTAL | 60 pts | ~40 min | |
Test-Taking Strategies
- For multiple choice: eliminate obviously wrong answers first.
- For open response: always state a claim, then provide evidence, then explain your reasoning (CER format).
- If stuck on a question, move on and come back — don't spend too long on one item.
- For manually graded questions (A4, B3, C3, D2): write at least 3 sentences with specific evidence.
Assessment Reminder
This is an assessment — no collaboration on answers. Use your own understanding. If you're unsure, write what you know and explain your reasoning. Partial credit is available for open-response questions.
Time Check: Stay on Pace
~10 minutes per section. After 10 minutes, move to the next section even if not fully finished. You can return to earlier sections if time allows.
Station 3 – Misconception Check
Identify and correct the three major Cycle 6 misconceptions.
Misconception Check (20 pts — 20 min)
Scientists update their thinking when evidence contradicts their beliefs. In this station, you'll identify wrong ideas about plate tectonics, explain what the evidence actually shows, and state the correct scientific understanding.
Cycle 6 Misconception Correction Table
| Misconception ID | Wrong Thinking | What the Evidence Shows | Correct Scientific Understanding |
|---|---|---|---|
| plates-float-magma | "Tectonic plates float on liquid magma like boats on water." | S-waves travel through the entire mantle (crust to outer core boundary), proving the mantle is solid. Liquid layers (outer core) block S-waves entirely. | Plates rest on the asthenosphere — a plastic solid that flows slowly over millions of years. The mantle is NOT liquid; only small pockets melt to form magma under specific conditions. |
| continents-move-fast | "Continents move quickly enough that you could notice over a lifetime." | GPS measurements show plate movement of 2–10 cm per year — comparable to fingernail growth. At this rate, it takes tens of millions of years for continents to noticeably shift position. | Plate movement is imperceptibly slow on a human timescale. The Atlantic Ocean took ~200 million years to open from a rift. You would need to live millions of years to see significant continental drift. |
| earthquakes-random | "Earthquakes happen randomly anywhere on Earth — you can't predict where they'll occur." | 35 years of earthquake data shows clear clustering along plate boundaries (Ring of Fire, Mid-Atlantic Ridge, Alpine-Himalayan Belt). Central continent interiors have almost no earthquakes. | Approximately 95% of earthquakes occur at plate boundaries where stress builds as plates interact. Earthquake hazard zones are predictable and well-mapped, enabling seismic risk assessment and building codes. |
Stop & Think: Were You Holding These Misconceptions?
Before answering the form, honestly ask: did you believe any of these wrong ideas at the START of Cycle 6? Which one was hardest for you to replace with the correct understanding? This self-reflection matters for your learning.
Part 3 — Misconception Check
Targeted check of the most common misconceptions from this cycle. (20 points, ~20 min)
Exit Ticket Structure
- 2 NEW questions — Synthesis & Assessment content (today's integration reasoning)
- 2 SPIRAL questions — Review from Cycle 5 (convection, atmospheric patterns) and Cycle 4 (human impact on Earth)
- 1 INTEGRATION + SEP-2 — Connect plate tectonics evidence across all 4 weeks using SEP-2 (Developing and Using Models)
Your Big Synthesis Prompt
Write ONE big idea that connects all four weeks of Cycle 6 into a single sentence or two. Start with Earth's internal heat and end with something you can observe at Earth's surface.
Concept Path (your sentence must hit at least 3 of these):
Stop & Think Before You Submit
For the INTEGRATION question, think about the BIG PICTURE: How does understanding Earth's interior (W4) explain why earthquakes and volcanoes (W1 & W3) cluster at plate boundaries — and why magnetic stripes (W2) prove those plates have been moving for millions of years? Connect all four weeks in your response.
Autonomy Support
You've just completed the most rigorous assessment of Cycle 6 — plate boundaries, seafloor spreading, volcanic systems, and Earth's interior. You've built a complete scientific model of a dynamic Earth. Trust what you've learned. The exit ticket is your chance to show the big picture understanding you've earned.
Enrichment & Extension
Go Deeper
Optional content if you finish early or want to go deeper.
Week 5 Complete!