A substance breaks down into its component elements when it’s heated if 68.0 G of the substance is present before it is heated what is the combined mass of the compound element after eating

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).

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )