6. Which of the following DOES NOT describe the inner core of the earth? A) It is solid B) It is liquid. C) It is the hottest part of the earth. D) It is composed of nickel and iron 7. What causes mushrooms to grow and multiply after lightning? A) Mushrooms increase their number of fruiting bodies after lightning B) Mushrooms react when exposed to a burst of high-voltage electricity C) Through lightning. mushrooms are given themselves a reproductive boost D) All of the above 8. What makes pure substance different from mixture? A) Pure substance has different properties while mixture has constant properties. B) Pure substance has combination of substances while mixture has no combination. C) Pure substance contains two or more molecules while moture contains one kind of molecule. D) Pure substance cannot be separated into any other kind while mixture is a combination of substances.