In a series of rock layers, a geologist finds fossils of a lizard-like dinosaur and a fern-like tree in layers that are 1.0 m and 1.5 m deep. However, in a layer that is 2.0 m deep, he finds fossils of bony fish and shellfish. Which explains his findings? A. The ancient sea dried up and became land. B. An asteroid hit the area, causing the dinosaur to become extinct. C. The continent shifted to a polar region. D. The ancient land area was invaded by a sea.

Question

In a series of rock layers, a geologist finds fossils of a lizard-like dinosaur and a fern-like tree in layers that are 1.0 m and 1.5 m deep. However, in a layer that is 2.0 m deep, he finds fossils of bony fish and shellfish.   Which explains his findings?    A. The ancient sea dried up and became land.    B. An asteroid hit the area, causing the dinosaur to become extinct.    C. The continent shifted to a polar region.    D. The ancient land area was invaded by a sea.