A bar magnet has a. one magnetic pole.
b. two magnetic poles.
c. three magnetic poles.
d. four magnetic poles.

Dry ice is solid carbon dioxide that is used in the transport of food and medicine. dry ice becomes a gas at –78.5°c without becoming a liquid first.

*drag each tile to the correct location in the sequence* the table shows chronological events in the life of our sun, a medium-sized star. place the missing events into the correct rows of the table.

Explain why electric current cannot exist if a current doesn't have a voltage source.