Answer:
It must be Energy is required to melt a solid because the cohesive bonds between the molecules in the solid must be broken apart so that the molecules can move around at comparable kinetic energies; thus, there is no rise in temperature. I hope this helps
Explanation:
Answer:
The transcontinental railroad became the gateway to the West. In 1862 the Republican-led Congress appropriated vast areas of land that railroad companies could use to lay their tracks or sell to raise funds for construction.
Answer:
The need to have better protection led to innovations in tools and weapons.
Explanation:
It began at a point when the various insignificant city-state rules of the Spring and Autumn period had been incorporated into seven significant contenders and a few insignificant enclaves. It was disturbed by two hundred years of brutality and combat. It profited from the leadership of philosophers who struggled with the king. It encountered strong guidance from feudal chiefs under the king.