In two or three sentences, describe the connection between the development of steel and the development of railroads

In what direction does the medium move relative to the direction of the wave? explain.

25pts the diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Phase changes are chemical changes. true or false