Erosion and Deposition — Unit test Answers

Which phrase describes the relative age of a rock?

Which best describes eras and periods?

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?

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

How might an entire insect be preserved?

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

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

Which correctly lists the three isotopes that geologists measure to determine the age of an organism’s remains?

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

Which is one piece of information that fossils in samples from Earth’s crust reveal about Earth’s history?

Which information can be determined using half-life?

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

After two half-lives, how much of the original material has decayed?

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.

Which statement explains one reason why unconformities occur?

A geologist finds four layers of sedimentary rock. She determines that no geologic events have shifted the layers. She labels the layers A, B, C, and D from the top to the bottom.Which statement about these layers is accurate?

Study the diagram of radioactive decay.

Which best explains how the collisions of materials in space contribute to the formation of layers in protoplanets?

The image shows sedimentary rock layers with index fossils and a fault.