TOEFL Practice Book

US Bill Of Rights
April 23, 2020
Check Your Vocabulary for TOEFL
April 24, 2020
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TOEFL Practice Book

Abstract

In view of these facts, scientists hypothesized that a single large asteroid, about 10 to 15 kilometers across, collided with Earth, and the resulting fallout created the boundary clay. Their calculations show that the impact kicked up a dust cloud that cut off sunlight for several months, inhibiting photosynthesis in plants.

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