Explain why crude oil is also called black gold.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Term "Black Gold":**
- The term "black gold" consists of two parts: "black" and "gold."
- "Black" refers to the dark color of crude oil, which is typically blackish or dark brown.

2. **Significance of "Gold":**
- "Gold" symbolizes something that is precious, valuable, and highly sought after.
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