Unit 4 Review

What statement is true about geologic history?

• The order of geologic time eras, from most recent to earliest time, is Paleozoic, Cenozoic, Mesozoic.

• Earth today is in the Cenozoic era, Quaternary period, and Holocene epoch.

• The Mesozoic era is subdivided into epochs.

• Geologic time has come to an end.

How are the geologic time scales divided?

• The epochs are divided into periods and the periods are divided into eras.

• The periods are divided into epochs and the epochs are divided into eras.

• The eras are divided into periods and the periods are divided into epochs.

• The periods are divided into eras and the eras are divided into epochs.

Based on the time scale, which statement is true?

• Rocks found in the Cambrian Strata were created before rocks found in Devonian Strata.

• Rocks found in the Cenozoic time period were formed before the other layers of rocks.

• Rocks found in the Paleozoic time period were formed after the other layers of rocks.

• Rocks found in the Pennsylvanian Strata were created before rocks found in the Mississippian Strata.

Which of the following analyzes a geological event on the basis of absolute time?

• Layer I is up to 20,000 years older than layer II.

• Rocks B and C are the same age.

• Rock A is younger than rock B.

• Layer I is younger than layers II and III.

Which comparison of the fossils is correct?

• Gastropods are older than ammonites but survived longer as a species.

• Gastropods are the oldest of all because they appear in the most layers.

• Crinoids went extinct for a while but then came back later.

• Crinoids are younger than corals but older than trilobites.

The image shows the location of two fossils, A and B, Which of the following is not true based on the picture above.

• Fossil A is older than the rock layer labeled "C".

• The animal that left fossil B lived before the animal that left fossil A.

• The animals that left the fossils were competitors for food and shelter.

• The animal that left fossil B was deceased long before the animal that left fossil A.

The index fossils (trilobite and ammonite) found in the rock layers are labeled. Which of the rock layers are likely of the same age?

• Rock layer 4 and rock layer 7

• Rock layer 4 and rock layer 6

• Rock layer 1 and rock layer 5

• Rock layer 2 and rock layer 5

The radioactive decay of material can be used to determine the age of fossils. This is called —

• Absolute Dating

• Complete Dating

• Fossil Dating

• Relative Dating

The approximate age of rock layers and fossils can be determined by a combination of relative dating and —

• Scientific Inquiry

• The law of uniformitarianism

• Levels of ancient Oxygen

• Absolute Dating

The figure above shows the temperature and height of the four layers of the atmosphere. Which statement is true about the layers of the atmosphere?

• Each layer of the atmosphere changes in temperature

• Atmospheric layers decrease in temperature as height increases

• individual layers of the atmosphere have a stable temperature

• The layers of the atmosphere become closer together as the temperature increases