2. Which of the following best describes significant digits? (A) Helps with estimation
(B) Indicates the precision of a measurement
(C) It is an exact number
(D) Used for counting of numbers

Can someone explain to me how to do this problem ?

Examine the nuclear reacti why is this classified as a nuclear reaction rather than a chemical reaction? it is not balanced. a new compound is formed. a change has occurred in a nucleus. a new element has been formed.

Which best describes how fluids change as they travel through different portions of the convection currents? they change to solids at the outer portion of the convection currents. they change to solids at the inner portion of the convection currents. they become more dense at the outer portion of the convection currents. they become more dense at the inner portion of the convection currents