How might a collision between neptune and halley's comet affect neptune's orbit?

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)

Specific heat refers to the amount of heat required to change 1 gram of a substance by degree(s) celsius

When using the scientist method, which step comes last?