D. amu
amu stands for atomic mass unit
Most renewable<span> energy comes either directly or indirectly from the </span>sun<span>. </span>Sunlight<span>, or solar energy, can be used directly for heating and lighting homes and other buildings, for generating electricity, and for hot water heating, solar cooling, and a variety of commercial and industrial uses.
</span>
Rust on a rock that contains iron
Mineral absorbs water and changes into a new substance
