38. Based on Study 3, what can one conclude about how average ash particle diameter changed with distance from Mount St. Helens?
I. It decreased between 50 and 200 km.
II. It increased between 325 and 450 km.
III. It decreased between 500 and 700 km.
Your Answer is
Correct Answer is J
Explanation
Looking at figure 3, the closer to the volcano, the larger the particle diameter, but there is an opposite trend at 325-450 km, and the particle diameter is decreasing at the distance of 500-700 km, so I, II, and III All correct