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### Question:
Place A is 1800 m above sea level and Place B is 700 m below sea level. We are asked to find the difference in the heights of these two places.

### Solution:
1. **Height of Place A**:  
   \[
   \text{Height of A} = +1800 \, \text{m}
   \]
   (above sea level, so it is positive)

2. **Height of Place B**:  
   \[
   \text{Height of B} = -700 \, \text{m}
   \]
   (below sea level, so it is negative)

3. **Difference in levels**:  
   The difference between the heights of A and B is given by:
   \[
   \text{Difference} = \text{Height of A} - \text{Height of B}
   \]
   \[
   \text{Difference} = 1800 - (-700) = 1800 + 700 = 2500 \, \text{m}
   \]

Thus, the correct answer is **2500 m** (option D).

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Would you like more details on this solution? 

Here are some related questions to explore:
1. What would be the difference if both places were above sea level?
2. How do negative heights affect the calculation of differences in elevation?
3. Can the difference between heights ever be negative?
4. How would this difference be represented on a graph?
5. If place A were at sea level, what would be the new difference in elevation?

**Tip:** Always keep in mind the sign of heights relative to sea level when performing subtraction to find the difference!

The height of place A is 1800 m above sea level. Another place B is 700 m below sea level as shown in figure 4-1. What is the difference between the levels of these two places?

Learn how to calculate the difference in elevation between place A (1800 m above sea level) and place B (700 m below sea level). This simple subtraction problem highlights the concept of relative height and absolute value, making it perfect for students in Grades 6-8.

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