Which scientific law states that matter cannot be created or destroyed?
a. first law of nature
b. newton's first law
c. universal gravitation
d. conservation of mass

Which of the following is considered to be a vector?               a.  temperature    b.  velocity    c.  time    d.  mass

Drag each item into the proper state of matter category.

How does a circuit breaker protect a refrigerator? a. when the current is too high, a metal strip in the fuse melts and opens the circuit. b. when the resistance is too high , a re-settable which opens a circuit c. when the current is too high , a re-settable switch opens the circuit d. when the resistance is too high a metal strip in the fuse melts and opens the circuit