Define average speed velocity

Which real-world scenarios below represent physical and chemical changes? -running a car -exploding fireworks -mixing water and powdered drink mix -combining oil and vinegar to make salad dressing -taking aspirin for a headache -diluting bleach with water-digesting dinner-spreading peanut butter on bread

Layers of rock containing fossils, like the layers illustrated here, are most likely composed of rocks.

1. list three scientific reasons cockroaches may fly.