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Continental crust is thicker and less dense than oceanic crust

Explanation:

Oceanic crust is thinner and denser than continental crust, which is made of light-colored rocks called andesite and granite. The low density of continental crust causes it to “float” high atop the viscous mantle.

Source: https://www.whoi.edu/oceanus/feature/unraveling-the-tapestry-of-ocean-crust/

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).