C, it’s global warming . Temperatures start to rise . Oceans get warmer as well.
The border between the outer core and the inner core is about 5,100 km<span> below the surface of the Earth. (The crust is usually between 3 and 70 km thick, being thicker in the continents and thinner in the oceans,)
Hope this helps, </span>
Oh wow is it telling you to drown or something?