astronomer's send probes to planet's to take pictures of their surfaces. an astronomer thinks that briny water flows on Mars because he noticed certain features in one picture of Mars. which method did the astronomer use to form this hypothesis?

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