Karin wants to remove iron shavings from a pile of sand. Karin has refrigerator magnets. She also has batteries, insulated wire, iron bolts, and tape. Select the correct button to show whether each statement is true of an electromagnet, a permanent magnet, or both. Some rows may have more than one button selected.

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length of a column of water 1.00 km high for a temperature increase of 1.00ºc. note that this calculation is only approximate because ocean warming is not uniform with depth. (answer in ×10^{-3} −3 m)