Here's why:
* Short vowel sounds are typically quick and sharp. In "cold," the "o" sound is quick and similar to the sound in words like "hot" or "cot".
* Long vowel sounds are typically longer and smoother, often sounding like the letter's name. In contrast, the "o" in "cold" doesn't sound like the letter "o" itself.
Let me know if you'd like to explore other vowel sounds!