Why is the oceanic crust more dense than the continental crust? A. It’s made of iron and magnesium
B. its made of iron and nickel
C. Its made of iron and lead
D. It’s made of iron and silicone

A It's made of iron and magnesium

Explanation: Oceanic crust is denser because it generally melts to a higher fraction than continental crust. When rocks melt some minerals melt before others. Generally lighter minerals melt before denser ones.

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the answer is: they occur when the sun, moon, and earth are aligned. in spite of their name, these tides occur twice a year in the spring and fall.

1. a tropical dry forest carries out more rapid nutrient cycling