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To solve this problem, we need to calculate the surface area of the Earth and then determine the portion covered by land.

### Given Data
- The diameter of the Earth = 8,000 miles.
- The Earth is 70% water, so 30% of the Earth’s surface is land.

### Steps
1. **Calculate the Radius of the Earth**: 
   \[
   \text{Radius} = \frac{\text{Diameter}}{2} = \frac{8000}{2} = 4000 \text{ miles}
   \]

2. **Calculate the Surface Area of the Earth** (assuming it’s a sphere):
   \[
   \text{Surface Area} = 4 \pi r^2 = 4 \pi (4000)^2
   \]
   Plugging in \( \pi \approx 3.14159 \):
   \[
   \text{Surface Area} \approx 4 \times 3.14159 \times 16,000,000 = 200,960,000 \text{ square miles}
   \]

3. **Calculate the Land Area** (30% of the total surface area):
   \[
   \text{Land Area} = 0.30 \times 200,960,000 \approx 60,288,000 \text{ square miles}
   \]

### Answer
The surface of the Earth covered by land is approximately **60,288,000 square miles**.

Would you like further details on any step? 

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Here are some related questions that might help deepen your understanding:

1. How would the result change if the diameter of Earth was different?
2. What percentage of Earth's surface area would be land if 80% were water instead?
3. How do different planetary diameters affect surface area calculations?
4. Why do we use 4πr² for the surface area of a sphere?
5. How is Earth's actual surface area affected by its non-perfect spherical shape?

**Tip:** Remember that surface area increases with the square of the radius, so small changes in radius can lead to large changes in surface area.

The surface of the earth is 70% water. If the diameter of the earth is 8,000 miles, how many square miles of the earth are covered by land?

Learn how to determine the surface area of Earth's land when 70% is covered by water, given a diameter of 8,000 miles. This problem covers geometry, surface area calculations, and percentage applications, ideal for high school students.

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