Complete the following sentences that describe evidence found in the K-T boundary layer. Drag words at the left to the correct blanks in the sentences at the right.
A. The presence of soot suggests that there were world-wide forest fires at the time this layer formed.
B. The presence of solidfied rock "droplets" is thought to indicate that rock splashed upward by an impact was molten as it fell back down from the sky.
C. The presence of shocked quartz suggests an impact because these mineral grains form only under high-pressure conditions.
D. The unusually high abundance of iridium in this layer suggests that this material came from the impact of an asteroid (or comet).
E. All of the above.
Answer: E. All of the above.
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