How must the height of A relate to the height of B for the skateboarder to have just enough energy to complete the loop? a) A can be shorter than B

b) A must at least be the same height as B

c) The skateboarder will never complete the loop

d) A must always be taller than B

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 (in m) of a column of water 1.45 km high for a temperature increase of 1.12°c. assume the column is not free to expand sideways. as a model of the ocean, that is a reasonable approximation, as only parts of the ocean very close to