Worksheet on seafloor spreading and plate tectonics, including historical context and calculation exercises.

Let’s solve this step by step.

First, we need to understand what the problem is asking. We’re told to refer to a map on Page 3 (which we don’t have), but since this is a worksheet and you’ve shared only page 1, I’ll assume that in your actual assignment, you have access to the map titled “Spreading at Mid-Ocean Ridge Between African and North America Plates” on Page 3.

Since I can’t see the map, I’ll explain exactly how YOU should solve it — using the instructions given on this page.

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Step 1: Find the Map Scale

Question 1 asks: What is the map scale?

On most maps, the scale is shown as a bar or written like “1 cm = X km”. Look at the bottom or side of the map on Page 3. It might say something like:

> “Scale: 1 cm = 500 km”

or show a line labeled with distances.

👉 Write down whatever the map says for the scale. For example, if it says “1 cm = 400 km”, then your answer to Question 1 is:
The map scale is 1 cm = 400 km.

*(Note: Since I don’t have the map, I’ll use an example value for demonstration. In your real work, use the actual number from your map.)*

Let’s pretend the map scale is:
1 cm = 500 km

We’ll use this for Question 2.

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Step 2: Measure Distances on the Map

Question 2 gives you a table and tells you to measure distances between points using a ruler (in centimeters), then multiply by the map scale to get kilometers.

Formula given:
Distance in kilometers = Distance in cm × Map scale in cm/km

Wait — actually, let’s read that again carefully.

It says:
> Distance in kilometers = Distance in cm x Map scale in cm/km

That wording is confusing. Actually, if the map scale is “1 cm = 500 km”, then to convert cm to km, you do:

Distance in km = (measured distance in cm) × (km per cm)

So if 1 cm = 500 km, then:

- If you measure 2 cm → 2 × 500 = 1000 km
- If you measure 3.5 cm → 3.5 × 500 = 1750 km

So the formula should really be:

> Distance in km = Distance in cm × (number of km per 1 cm)

In our example, that’s × 500.

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Step 3: Fill in the Table

You need to measure these on your map with a ruler:

#### Locations:
1. Point A and Point B → measure in cm → multiply by scale → write km
2. Point B and Point C → same
3. Point A and Point C → same
4. North America and Africa (measure between dots) → same

Again, since I don’t have the map, I’ll make up realistic measurements based on typical seafloor spreading maps.

Let’s assume on your map:

- Point A to Point B = 2.0 cm
- Point B to Point C = 3.0 cm
- Point A to Point C = 5.0 cm (since A to B + B to C = 2+3=5)
- North America dot to Africa dot = 8.0 cm

And map scale = 1 cm = 500 km

Now calculate:

1. A to B: 2.0 cm × 500 km/cm = 1000 km
2. B to C: 3.0 cm × 500 km/cm = 1500 km
3. A to C: 5.0 cm × 500 km/cm = 2500 km
4. NA to Africa: 8.0 cm × 500 km/cm = 4000 km

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Important Note:

These numbers are EXAMPLES. You MUST use the actual measurements from YOUR map on Page 3. The values will be different depending on your printed worksheet.

Also, double-check your ruler measurement — hold the ruler straight, start at zero, and read carefully.

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Final Answer:

Since I cannot see your map, here is how you should format your answers after measuring:

1. What is the map scale?
→ [Write what your map says, e.g., “1 cm = 500 km”]

2. Using the map scale, calculate the distance...

| Locations | Distance (km) |
|------------------------------------|---------------|
| Point A and Point B | [your calc] |
| Point B and Point C | [your calc] |
| Point A and Point C | [your calc] |
| North America and Africa (dots) | [your calc] |

✔ Remember: Replace [your calc] with your actual measured cm × map scale.

If you tell me what your map scale is and what you measured for each pair, I can help you check your math!