Geologic Time — Unit test Answers

What does the presence of new rock near an oceanic ridge indicate?

Which statement describes one event that happens at deep-ocean trenches?

Which phrase describes the relative age of a rock?

The image shows flat sedimentary rock layers in the foreground and angled sedimentary rock layers in the background.

Which best describes eras and periods?

For which object would a geologist use carbon-14 dating to determine age?

Which is the first step in the process during the formation of molded fossils?

Study the diagram of the geologic time scale.Which method is most likely used to identify what happened before the start of the Paleozoic era?

Which plate forms a boundary with the African Plate?

Which statement best describes the theory of plate tectonics?

Which information can be determined using half-life?

Which evidence suggests that several mass extinctions have occurred during Earth's history?

When were Earth’s landmasses first recognizable as the continents we know today?

Which indicates how evidence of climate change supports the theory of continental drift?

In which layer of the Earth does the motion of the convection currents drive plate movement?

How did Wegener explain why fossils of land animals were found on continents that are across oceans from one another?

Which best explains a primary reason for the inability of life to exist in Earth’s early atmosphere?

Which feature causes a gap in the geologic record?

The image shows cross-cutting relationships. B, W, E, and K represent rock layers, and Q represents a fault.

What may occur when convergent boundaries interact?