Both sound and light waves travel through matter, but only light waves travel through
a. a vacuum.
b. liquids.
c. fire.

the focus of lesson 1 is newton's first law of motion - sometimes referred to as the law of inertia. newton's first law of motion is often stated as. an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

explanation:

their crystal patterns have been disrupted by stress