Here's how you might categorize each activity as skimming or scanning:

1. **Looking up a word in the dictionary** - **Scanning**
2. **Browsing the internet for the latest news stories** - **Skimming**
3. **Choosing a book from a library or bookshop** - **Skimming**
4. **Finding a particular news story in a newspaper** - **Scanning**
5. **Finding the price of a product in a catalogue** - **Scanning**

**Explanation:**
- **Scanning** is used for locating specific information quickly (like definitions, prices, or a specific news story).
- **Skimming** involves looking over the material to get a general idea (like finding news stories or choosing books).