Oceanic crust is composed mainly of basalt .continental crust is composed mainly of granite .why does oceanic crust generally tend to subduct under continental crust when plates collide

When elements that form a mineral dissolve in hot water, they form a mixture called a(n) a)geode b)vein c)evaporation d)crystallization e)magma f)lava g)solution h)gem

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

Which scientific design has both practical limitations and limitations due to scale? studying the effect of bleach on the growth of mold spores exposing cultures of duckweed to different intensities of light observing the replication of dna molecules with a hand lens using colored marbles to model a cross between two colors of rabbits