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Geologists have divided the Earth’s history into time units based on rock layers and the fossils found in those layers. These time units make up the ______ time scale → record of the Earth’s history. Started in 1975 but constantly revised with new data. GEOLOGIC TIME SCALE GEOLOGIC TIME SCALE BASICS The history of the Earth covers a vast expanse of time, so scientists divide into smaller sections that are associated with particular events that have occurred in the past. The approximate time range of each time span is shown on the poster. EON → the largest time span of the ______ time. It is an indefinitely long period of time that contains at least two eras. Each eon is subdivided into smaller spans called → ERA An era is often divided into several smaller time spans called → PERIODS A period is divided into an even smaller unit called an → EPOCH GEOLOGIC TIME PRECAMBRIAN EON →Represents 80% of Earth’s history and 88% of ______ time →Also.
geologic
Each eon is subdivided into smaller spans called → ERA An ______ is often divided into sev______l smaller time spans called → PERIODS A period is divided into an even smaller unit called an → EPOCH GEOLOGIC TIME PRECAMBRIAN EON →Represents 80% of Earth’s history and 88% of geologic time →Also.
era
Each eon is subdivided into smaller spans called → ERA An era is often divided into several smaller time spans called → PERIODS A ______ is divided into an even smaller unit called an → EPOCH GEOLOGIC TIME PRECAMBRIAN EON →Represents 80% of Earth’s history and 88% of geologic time →Also.
period
Each eon is subdivided into smaller spans called → ERA An era is often divided into several smaller time spans called → PERIODS A period is divided into an even smaller unit called an → EPOCH GEOLOGIC TIME PRECAMBRIAN EON →Represents 80% of Earth’s history and 88% of geologic time →Also.
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Each eon is subdivided into smaller spans called → ERA An era is often divided into several smaller time spans called → PERIODS A period is divided into an even smaller unit called an → EPOCH GEOLOGIC TIME PRECAMBRIAN EON →Represents 80% of Earth’s history and 88% of geologic time →Also.
Signup and view all the answers
Study Notes
Geologic Time Scale Basics
- The Earth's history is divided into time units based on rock layers and fossils found in those layers.
- The geologic time scale is a record of the Earth's history, which has been revised since its introduction in 1975 with new data.
Time Units
- An Eon is the largest time span, which is an indefinitely long period of time containing at least two eras.
- An Era is a smaller time span within an Eon, often divided into several Periods.
- A Period is a smaller time span within an Era, divided into an even smaller unit called an Epoch.
- An Epoch is the smallest unit of time, within a Period.
Precambrian Eon
- The Precambrian Eon represents 80% of the Earth's history and 88% of geologic time.
- It is subdivided into smaller spans called Eras, which are further divided into Periods and Epochs.
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Description
Test your knowledge of Earth's history with this quiz on the geologic time scale. Explore the basics of rock layers, fossils, and the division of Earth's history into time units. See how well you understand the concepts that form the foundation of geology.
