The correct answer is: [C]: " granite " .
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The significance of the yearly flooding of the Nile Valley is important because it replenishes nutrients in the soil and makes the land more fertile for plants to grow.
I believe B. the material is cooler and denser would be correct.
The colder something is, the more density it has. Earth's core is too hot to be very dense, so that's why I would go with B.
These four subsystems are called "spheres." Specifically, they are the "lithosphere" (land), "hydrosphere" (water), "biosphere" (living things), and "atmosphere" (air). Each of these four spheres can be further divided into sub-spheres
