an underground explosion generates sound waves that travel through solid rock, then through a lake and then air. describe how the speed of the waves will change during this journey and explain why.

What provides structure to the human body?

Which atom or ion is the largest? a. k b. k+ c. ca d. ca2+ e. li

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.