Unit Test — Unit test Answers

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

Which feature causes a gap in the geologic record?

Which best describes eras and periods?

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

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

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

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 phrase describes the relative age of a rock?

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

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

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 information can be determined using half-life?

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?

Which phrase describes one characteristic of radioactive elements?

Which feature do amber fossils have that mold fossils do not?

Which feature forms at Earth’s surface from the cooling of lava?

A geologist finds some tilted sedimentary rock layers.Which conclusion can the geologist draw by looking at the rock layers?

How did the formation of the ozone layer contribute to the existence of life on Earth?