What do the van allen belts do for us and how do they relate to the core?

Which of these would be caused by a chemical change? a) the formation of lava. b) sedimantary rock layering over time. c) metamorphic rock forming from igneous. d) metamorphic rock eroding to form sedimentary rock.

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5

Once similarity and one difference between a mixture of elements and a mixture of compounds