Here's why:
* Descriptive means relating to or characterized by description.
* Observations are the act of noticing and recording something.
So, when you use your senses to gather information about something and then use words to describe what you see, hear, smell, taste, or touch, you're making descriptive observations.
For example:
* "The sky is blue and cloudy." This is a descriptive observation about the sky.
* "The cat is fluffy and purring." This is a descriptive observation about the cat.
Descriptive observations are often the first step in scientific inquiry, as they help us to gather information about the world around us.