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The core (Earth's interior, as you stated above) is believed to be composed of iron (80%), as well as nickel and several light elements, whereas other dense elements like uranium and lead are either too uncommon to be obvious, or may bind to the lighter elements and stay in the Earth's crust. Some people once argued that the inner core could actually be in the form of one single iron crystal. :O and since the inner core of the Earth is extremely hot, and all hot things cool over time, the Earth's core is solidifying over time (though VERY slowly so don't worry)

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