Q38. What geologic feature do you think will be formed at the surface of thecrust?Answer: Volcanoes will be formed.Q39. Which of the features at the surface of the crust will be the oldest? theyoungest? Label these on your paper.Answer: The oldest volcano will be the first one that developed while theyoungest volcano is the last one that was formed.Q40. Which of the features will be the most active? The least active? Labelthese on your paper.Answer: The most active volcano is the youngest one (the one that iscurrently on top of the magma source). While the least activevolcano, is the oldest (because it is already cut-off from the source ofmagma).