2C4H10 + 13O2 --> 8CO2 + 10H2O Which is true about the reaction shown above?

The reaction has two elements that combine to form a compound.

The reaction releases energy.

The reaction is a single replacement.

The reaction has negative ions in two of the compounds that switch places.

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).

the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.