PLEASE HEL ASAP these changes require energy. there are two main sources of energy in the rock cycle. one source is external to earth, one is internal to earth. write a brief paragraph that identifies these sources of energy, and give an example of how each source of energy causes rock to change form

just go with your heart buddy

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.