Which of the following statements about weathering is true? a. physical and chemical are the two types of weathering. b. weathering occurs when rocks are subjected to the movement of wind or water. c. humans are the only cause of weathering. d. movement is required for weathering to take place.

a. Physical and chemical are the two types of weathering

the most common energy conversion is from kinetic energy to potential energy, and then from potential energy to kinetic energy.

later on comes the heat energy, mechanical energy, and other energy conversions.

this energy conversion is so common that we can find it in our day to day lives as well.

- one of the most common energy conversions involves the changing of potential energy to kinetic energy or kinetic energy to potential energy

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.