Earth is approximately a sphere with a radius of 6400 km.

**a**  Calculate the surface area of Earth, correct to the nearest 10 square kilometres.

**b**  Approximately 70% of Earth’s surface is water. What area of Earth’s surface is covered with water?

**c**  What area of Earth’s surface is land?

Let's break down the problem and solve it step by step.

### Part (a): Calculate the surface area of Earth

The surface area \( A \) of a sphere is given by the formula:

\[
A = 4\pi r^2
\]

Given:
- Radius \( r = 6400 \) km

Let's calculate the surface area of Earth.

### Part (b): Area of Earth's surface covered with water

If 70% of Earth's surface is covered with water, the area covered by water can be calculated as:

\[
\text{Water Area} = 0.7 \times \text{Total Surface Area}
\]

### Part (c): Area of Earth's surface that is land

The area of Earth's surface that is land is simply the remaining 30% of the total surface area:

\[
\text{Land Area} = 0.3 \times \text{Total Surface Area}
\]

Let's calculate these values now.Here are the results:

**(a)** The surface area of Earth is approximately **514,718,540 square kilometers**, rounded to the nearest 10 square kilometers.

**(b)** The area of Earth's surface covered with water is approximately **360,302,980 square kilometers**.

**(c)** The area of Earth's surface that is land is approximately **154,415,560 square kilometers**.

Would you like to dive deeper into any of these calculations or have any further questions?

Here are five related questions you might find interesting:
1. How does the surface area of Earth compare to that of other planets in our solar system?
2. What is the volume of Earth if we consider it as a sphere?
3. How would the surface area change if Earth's radius were 1% larger?
4. How can you calculate the circumference of Earth using its radius?
5. If Earth's surface area were 80% water, what would the land area be?

**Tip:** Understanding the proportions of water and land on Earth's surface can be critical for studies in geography, environmental science, and climate change analysis.

Learn how to calculate the surface area of Earth and the percentage covered by water with detailed step-by-step solutions. Earth's surface area is approximately 514,718,540 square kilometers, with about 70% covered by water and 30% as land. Suitable for Grades 9-12 students and anyone interested in geography and environmental science.

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