Which of the following lies on the earth's surface?

Options

A. Seismic focus
B. Epicentre
C. Mantle
D. Core

Explanation

To solve the question "Which of the following lies on the Earth's surface?" we need to analyze the options provided:

1. **Seismic focus**
2. **Epicenter**
3. **Mantle**
4. **Core**

### Step-by-Step Solution:

**Step 1: Understand the meaning of each term.**

- **Seismic Focus**: This is the point inside the Earth where an earthquake originates. It is located below the Earth's surface.

- **Epicenter**: This is the point on the Earth's surface that is directly above the seismic focus. It is the location where the effects of the earthquake are felt most strongly.

- **Mantle**: This is a layer of the Earth located beneath the crust and above the core. It is not on the surface; it is located several kilometers below the Earth's surface.

- **Core**: This is the innermost layer of the Earth, consisting of a solid inner core and a liquid outer core. It is also located deep within the Earth, far below the surface.

**Step 2: Identify which option lies on the Earth's surface.**

From the definitions:
- The **Seismic Focus** is not on the surface; it is underground.
- The **Epicenter** is on the Earth's surface.
- The **Mantle** is below the surface.
- The **Core** is also below the surface.

**Conclusion**: The only option that lies on the Earth's surface is the **Epicenter**.

### Final Answer:
The correct answer is **Option 2: Epicenter**.

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