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15. What happens when plates move apart?

lava surges up to create new crust. usually makes new ocean floor in the open ocean.

Explanation:

as tectonic plates slowly move away from each other, heat from the mantle's convection currents makes the crust more plastic and less dense. This rock (basalt) becomes a new part of Earth's crust. Mid-Ocean Ridges. Seafloor spreading occurs along mid-ocean ridges—large mountain ranges rising from the ocean floor.

Explanation:

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d) a constitutional amendment

(202 bc - 220 ad) dynasty started by lui bang; a great and long-lasting rule, it discarded the harsh policies of the qin dynasty and adopted confucian principles; han rulers chose officials who passed the civil service exams rather than birth; it was a time of prosperity