Identify whether the plastic flakes separate out to form a sediment when the globe is left still.

To answer this question, you would need to follow these steps:

1. Obtain the globe with plastic flakes inside. This is typically a snow globe or similar object.

2. Place the globe on a flat, stable surface where it will not be disturbed.

3. Leave the globe still for a period of time. This could range from a few minutes to a few hours, depending on the size of the flakes and the viscosity of the liquid inside the globe.

4. After the set period of time, observe the globe. If the plastic flakes have settled at the bottom of the globe, they have separated out to form a sediment. If they are still suspended in the liquid, they have not.

5. Record your observations.

Please note that this is a general procedure and the actual results may vary depending on the specific globe and flakes in question.