What four things
are required for photosynthesis?

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)

What can you increase the strength of an electromagnet by

Awave has a wavelength of 7 mm and a frequency of 19 hertz. what is its speed?