Earth's core is composed of two separate layers the inner core and the outer core what is one difference between these two layers? f. one is orphans one is zinc g. one is liquid and one is gas h. one is solid and one is liquid i. one is iron and one is nickel

What are two different ways you could find the value of a? explain these methods.

Jenny wants to test the electrical conductivity of two substances dissolved in water. she is preparing the containers for the experiment. which factor is most important for her to control? a) volumes of the solutions b) appearance of the solutions c) temperatures of the solutions d) concentrations of the solutions

When can a theory be modified if a new type of technology allows for new observations that raise new questions? a-immediately, while the questions about the theory are being asked b-after new hypotheses related to the theory are tested in experiments c-only after the new observations disprove all parts of the theory d-while scientists begin to think about how the theory could improve