The Earth is divided into three chemical layers: the Core [Inner Core (D) and Outer Core (C)], the Mantle (B) and the Crust (A). The Core is predominantly composed of iron and nickel. Even after 4.5 billion years of cooling, the Earth's core remains very hot.
Answer:
if gibbs free energy change is negative then the reaction is spontaneous
<span>Hydrogen-2 has one neutron; hydrogen-1 has none</span>
14 - 2nd one
15 - I do not know
16 - also do not know
Sorry
