Dating Part 1

What is relative dating?

• the process of determining if one rock or geologic event is older or younger than another, without knowing their specific ages

• Species that existed for relatively short periods of time

• layers on the bottom are older than layers on the top

• radiometric dating

Tags

NGSS.MS-ESS1-4

Which of these is the law of superposition?

• Horizontal sedimentary layer overlies another horizontal sedimentary layer that has been eroded (can be even or uneven)

• sediments are deposited horizontally

• Layers on the bottom were deposited first

• When part of the rock record is deformed or lost due to Earth’s surface changing

Which are the three kinds of uniconformity?

• Discomformity

• Noncomformity

• Acomformity

• Angular Unicomformity

Tags

NGSS.MS-ESS1-4

True/false: Crosscutting is when layers of rocks are formed before the layers they cut through.

• True

• False

Tags

NGSS.MS-ESS1-4

Noncomformity is...

• when the eroded surface is easy to see when sedimentary rock is on top of igneous/metamorphic

• when new rock forms on top of a tilted/eroded layer of rock

• when part of the rock is deformed

• one horizontal layer overlies another horizontal layer that has been eroded

Tags

NGSS.MS-ESS1-4

What is an index fossil?

• abundant, easily recognized fossils used to date rock layers

• a fossil of hardened tree sap

• a way to date organisms

• species that existed for long periods of time

Tags

NGSS.MS-LS4-1

Relative dating is the ____ in which events occur.

• time

• order

• climate

• epoch

Tags

NGSS.MS-ESS1-4

Which type of dating involves the law of superposition, crosscutting, inclusions, and index fossils?

• absolute

• relative

• index

• superposition

What are the two types of dating?

• Relative

• Speed

• Rock

• Absolute

Tags

NGSS.HS-ESS1-5