Groundwater erosion can result in the formation of stalactite and stalagmite in caves true or false ?

Which of the following would not be taken into consideration when describing the quality of a sound

An electric current in a wire will push or pull on a permanent magnet. which statement best explains how an electric current creates an electromagnetic force on another magnet?

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid