There are no self-sustaining fusion reactors operating in the world because there is currently a lack of .a. a way to achieve the extremely high temperatures needed for a fusion reaction. b. a method to dispose of the waste produced by fusion reactions. c. a way to contain fusion reactions. d. materials that will participate in fusion.

Electromagnets coils of wire paper clips picked up 10 3 15 6 20 9 25 12 ms. owens' class was studying magnets. ms. owens showed her students how to make an electromagnet using a nail, a d-cell battery, and plastic coated wire. the students wrapped the wire around the nail and then attached the ends to the battery. when they were finished, they tested their magnets by investigating how many paperclips their magnets could pick up. they also tested whether they could increase the strength of their electromagnets by using more coils of wire. they recorded the class average of their results in the data table seen here. ms. owens asked her students to graph their data in a line graph. how should the students label the x-axis on their line graph? a) size of battery b) number of paper clips c) number of coils of wire d) strength of electromagnet

Which process describes vaporization that takes place below the surface of a liquid? condensation melting boiling evaporation

The half-life of a certain element is 100 days. how many half-lives will it be before only one eighth of this elementremains?