Topic 8 Lesson 1 Ages of rocks

The rock formation labeled "P" is a(n)...

• fault
• intrusion
• inclusion
• unconformity

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NGSS.MS-ESS1-4

Luisa has two older brothers and a younger sister. She had been learning about how to describe the ages of rocks. After thinking about it, she realized she could compare people's ages in her family in the same way that scientists compare rocks. Which geology term would describe the way Luisa compares the ages of people in her family?

• superposition

• rock layers

• relative age

• absolute age

What does the law of superposition indicate?

• The rock layers can change their position and push younger rock layers under older rock layers.

• The rock layers can change their position and push older rock layers under younger rock layers.

• The rock layers on top are the youngest layers, and the lower rock layers are the oldest layers.

• The rock layers on top are the oldest layers and the lower rock layers are the youngest layers.

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NGSS.MS-ESS1-4

. The index fossils help scientists study rock ages. In what way do index fossils help determine rock ages?

• Index fossils are widely distributed but were not around long, and so they show up in only a few rock layers.

• Index fossils are widely distributed and were around for a long time, and so they show up in many rock layers.

• Index fossils were around only a short time but they show up in many rock layers.

• Index fossils are widely distributed and are always found in every sedimentary rock layer.

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What could have happened to layer B at this location?

• Animal Abrasion

• Erosion

• Ice Age

• Earthquakes

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NGSS.MS-ESS1-4

NGSS.MS-ESS2-2

When atoms of one element break down into another, more stable element.

• Half Life

• Radioactive Decay

• Shelf life

• Full life

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NGSS.HS-PS1-8

The age of a rock compared to the ages of other rocks.

• relative age
• half-life
• absolute age
• radioactive decay

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NGSS.MS-ESS1-4

Which layer is younger than layer 4?

• 2

• 1

• 6

• 3

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NGSS.MS-ESS1-4

Each radioactive element has a constant rate of decay that is called its

• Radioactive Dating

• Half Life

• Radioactive Decay

• Full Life

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NGSS.HS-PS1-8

Mia knows that scientists use several methods to help determine the relative ages of different rock layers, including using fossils. Which of the following are other ways to determine the relative ages of rock layers? Choose the three that apply.

• faults

• law of superposition

• radiometric dating

• rock half-life

• igneous intrusions