Why are some scientists concerned abot the carbon dioxide in our atmosphere

What is the identity of the planets?

Are the layers of rock above and below the coal older or younger?

Dr. arenas is a scientist who has been trying to determine if increasing pressure will increase the sound that occurs when two chemicals explode. it measures the volume of the sound that occurs at the minimum pressure at which the explosion will occur. it then increases the pressure and measures the volume of the explosions that occur. what kind of investigation is the scientist conducting?