Passage II
A lahar is a flow of water-saturated volcanic ash and rock. A lahar deposit, formed once the flow stops, consists of clasts (rocks having diameters ≥ 16 mm) embedded in a matrix (a mixture of particles having diameters ≤ 8 mm).
A sample of a lahar deposit was collected at each of 7 distances from a volcano's crater. For each sample, Figure 1 shows the percent by mass of the clasts by composition, and Figure 2 shows the percent by mass of the matrix by particle size class. For the 7 samples combined, Figure 3 shows the cumulative percent by mass of clasts and matrix particles, or of clasts alone, as diameter decreases.
7. According to Figure 3, the largest increase in cumulative percent by mass was between which of the following diameters?
Your Answer is
Correct Answer is C
Explanation
Largest increase, look at the part with the largest slope. Corresponding to figure 3, it should be the abscissa 1-0.5mm part