What goes on at the center of earth?

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

How does a lytic infection differ from a lysogenic infection?

Why is earth's outer core hotter than earth’s oceanic crust? earth’s oceanic crust is denser than earth’s outer core is. earth’s oceanic crust has lava flowing from the mantle. earth’s outer core has a composition of solid iron and nickel. earth’s outer core is deeper within earth than oceanic crust is.