transparent  - objects that allow light to pass through them , translucent - some light can pass through it, opaque - Light cannot pass through it, shadow - dark area where an opaque objects block light, straight line - light travel in a ________, source of light  - anything that gives light is called....., light - a form of energy that allow us to see, Natural source of light  - sun, star, firefly, and lightning, Artificial source of light - lamp, television , and bonfire , reflects light - We can see things because an object ___, transparent, translucent, opaque,

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