Grade 7 Social Sciences (SS) (Geography & History) Term 2 (Via ... - Free Printable

Let’s solve this step by step.

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Part 1: Match Column A with B (Diagram Labels)

We are given a diagram of Earth’s layers, labeled A to F. We need to match each letter to the correct layer name from the list:

- Mantle
- Oceanic crust
- Core
- Continental crust
- Inside core (this likely means “Inner core”)
- Outer core

Looking at standard Earth structure diagrams:

- A points to the very center → that’s the Inner core (“Inside core” in the options)
- B points to the whole central part including inner and outer → that’s the Core
- C is the thin outer layer on land → Continental crust
- D points to the ocean area → so it’s pointing to the Oceanic crust (the crust under oceans)
- E is the thick middle layer between crust and core → Mantle
- F is the layer just outside the inner core → Outer core

So matching:

1.1) A → Inside core
1.2) B → Core
1.3) C → Continental crust
1.4) D → Oceanic crust
1.5) E → Mantle
1.6) F → Outer core

✔ All matched correctly based on standard Earth layer models.

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Part 2: Answer Questions Based on Pictures

2.1 Give the diameter of the Earth.

From general knowledge (and commonly taught in Grade 7), Earth’s diameter is about 12,742 kilometers. Sometimes rounded to 12,700 km or even 13,000 km for simplicity — but since this is a school worksheet, we’ll use the most common accurate value taught: 12,742 km.

But wait — let’s check if the picture gives any clue? The first image says “Earth diameter” with a line across — no number shown. So we must rely on known fact.

In many curricula, especially South African (since footer says “Via Afrika”), they often teach 12,756 km (equatorial) or 12,714 km (polar). But again, for Grade 7, 12,742 km is average and acceptable.

However, sometimes worksheets expect you to write what was taught in class. Since we don’t have that, we go with standard scientific value.

→ Let’s use 12,742 km

*(Note: If your teacher uses a different number like 12,800 km or 13,000 km, use that — but 12,742 is scientifically accurate.)*

2.2 What does the inner core consist of?

The inner core is made mostly of iron and nickel, solid due to extreme pressure.

Answer: Iron and nickel

2.3 How hot is the inner core (Degrees Celsius)?

Scientific estimates say the inner core is about 5,400°C to 6,000°C. Commonly, textbooks say around 5,500°C.

We’ll go with 5,500°C as it’s the most frequently cited value for Grade 7 level.

2.4 What liquid substance do we find in the mantle?

Wait — actually, the mantle is mostly solid rock, but it can flow slowly over time (like plastic). However, there is magma (molten rock) found in parts of the upper mantle, especially near plate boundaries.

But strictly speaking, the mantle itself isn't liquid — the outer core is liquid iron/nickel.

Hmm… maybe the question is tricking us? Or perhaps it’s referring to magma?

Actually, looking back: “What liquid substance do we find in the mantle?”

Technically, the mantle contains partial melt zones where magma forms. So the answer expected here is probably magma.

Some might say “molten rock”, but “magma” is the correct term.

✔ Final answers:

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Final Answer:

1.1) A → Inside core
1.2) B → Core
1.3) C → Continental crust
1.4) D → Oceanic crust
1.5) E → Mantle
1.6) F → Outer core

2.1) 12,742 km
2.2) Iron and nickel
2.3) 5,500°C
2.4) Magma