Earth History (Geologic)

Which rock layer is the oldest

• A
• E
• D
• C

A rock is formed by the cementing of layers of sediment.  What type of rock is formed?

• Volcanic
• Igneous
• Sedimentary
• Metamorphic

Definition: Division of Earth's History into time units based on the types of life-forms that lived only during certain periods

• Fossil
• Geologic Time Scale
• Extincton
• Law of superposition

Definition: Remains of a species that existed on Earth for a relatively short period of time, were abundant and geographically widespread, and can be used by geologists to assign ages to rock layers

• Index Fossils
• Half-Life
• Radioactive dating
• Trilobites

April is older than Zack, who is older than Rick.  This is an example of:

• Relative Dating
• Absolute Dating
• Law of superposition
• radiometric dating

Many fossils of marine organisms are found in what is now desert.  Which hypothesis best explains this?

• marine organisms lived on land in the past
• the desert was once an ocean
• the desert moved from the equator south
• the fossils were moved by people

A rock has formed by the cooling of liquid rock beneath the surface of the Earth.  Which type of rock formed?

• Metamorphic
• Sedimentary
• Igneous
• fossilized

Definition: the age of something compared to other things. "NOT" true age

• Absolute age
• Law of superposition
• Half-Life
• Relative age

Which best describes how ice cores are important to the study of geologic history?

• they follow the Law of Superposition, which gives reasons for extinctions of species.
• they contain evidence showing changes in the atmospheric composition over time
• they hold index fossils, which are used to date the different ice cores
• they show unconformities, which signal change in deposition

Definition: Time it takes for half of the atoms of an isotope (element) to decay

• Absolute Age
• Half-Life
• Relative Age
• Index Fossil