Answer:
You used the property of density.
Explanation:
The ice cube floats in water because it is less dense and sinks in alcohol because it is more dense than the alcohol.
Answer: a digital signal
Explanation:
A smog, coming from the terms "smoke" and "fog", is an air pollutant while the Ground-level ozone, or also known as tropospheric ozone, is just a part or constituent of all the other air pollutants that make up the smog.