Answer:
C- convection (convectional current)
Explanation:
Convection occurs in fluids e.g gases and liquids. It is the prices by which heat energy is transferred in a fluid by the actually movement of the heated fluid.
It is also called convectional current when the term current is used in the question.
Science can create new forms of energy that dont use coal for example; hydroelectricity, wind power, solar power, steam power, fusion, fission, etc.
Or science can create more efficient ways to use the resources.
If a salt has a pH less than 7, then it is an acid. All acids start with a H in there formula. The only compound that starts with an H from the listed options is HCOOK.
So the salt HCOOK has a pH<7
