Why is graphite used as a pencil lead?

Explanation

**Step-by-Step Text Solution:**

1. **Color of Graphite**: The first reason graphite is used as pencil lead is that it is black in color. This color is ideal for writing and drawing, as it provides good contrast against white paper.

2. **Layered Structure**: Graphite has a unique layered structure. Each layer is made up of carbon atoms arranged in a hexagonal pattern. These layers can slide over each other easily, which contributes to the smoothness of writing.

3. **Slippery Nature**: The slippery nature of the layered structure allows the pencil lead to glide smoothly across the paper. This property ensures that writing is effortless and consistent.

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