Stratigraphy
Time Period
Relative and Absolute Dating
Vocabulary
Miscellaneous
100

The study of rock layers that is part of geology is known as 

Stratigraphy 

100

How old is the Earth 

4.6 billion years old

100

Saying you are older than a baby is an example of relative dating or absolute dating ?

Relative Dating

100

Sedimentary Rocks

Rocks made from sediments deposited by wind, water, etc. 

100

T/F ? When a whole species dies all at once it is called a mass extinction 

True

200

What are Strata ?

Strata are rock layers. 

200

During what period did dinosaurs rule the Earth?

Mesozoic 

200

Absolute dating is also known as what?

Radiometric and radioactive dating 

200

Chronological 

occurring or going in order of time

200

What evidence do scientists use to determine the age of the Earth? 

Index Fossils, Earth Strata, Radioactive Dating, Relative Dating

300

What is the law of superposition 

It states that the layer on top is younger than the layers on the bottom.

300

Most of the history of life on the earth has only occurred recently. True of False

True 

300

 Which layer is the oldest?

Layer C

300

Law of Lateral Continuity 

a sedimentary rock layer that extends sideways as wide as the basin in which it forms.

300

What characteristics must index fossils have ?

Recognizable, short life-span, wide distribution 

400

Explanation of why layers of the earth might be altered include: The law of superposition, The law of gravity and the law of motion, Principle of Cross-Cutting relationships, Radioactive Isotopes

Principle of Cross-Cutting Relationships 

400

What era are we currently in ?

Cenozoic 

400

What is relative age ?

When comparing two rock layers to see which is older or younger.

400

Unconformity 

A lack of continuity in deposition between rock strata  

400

What are some things we can learn from studying the rock layers

Climate, environment, age of rocks, animals and plants that lived there

500

If the same index fossils are found in different rock strata miles apart, what is probably true about the rock layers?

The strata are from the same relative time period 

500

What time period lasted the longest ?

Precambrian Time

500

What is absolute dating ?

Absolute dating is finding the exact age of a rock or a rock layer 

500

Principle of cross-cutting relationships

If there is an igneous intrusion or a fault it is younger than the layers around it

500

What leads to diversity of life and why?

Sexual reproduction, genetic variation from two parents