What determines the amount of chemical energy a substance has. 6th grade level

Which is the layer underground where all empty spaces are filled with a combination of air and water ?

Ineed this asap part i: scientific method what is the difference between science and pseudoscience? what is the scientific method?

6. using 3 – 4 sentences explain (in your own words) why water expands when it freezes? 7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation.