8-2 Rock Layers

What is an intrusion?

• magma that hardens into igneous rock below the surface

• lava that hardens on the surface

• a break in the Earth's crust

• a rock within a rock

A fault is

• magma that hardens below the surface

• lava that hardens on the surface

• a break in the Earth's crust

• a rock within a rock

The Law of Superposition states that

• the layer on the top is the youngest.

• the layer on the bottom is the youngest.

• all of the layers are the same age.

• the layers in the middle are the youngest.

Tags

NGSS.MS-ESS1-4

Saying that a rock is 10,000 years old is an example of

• relative dating.

• absolute dating.

• a fossil.

• an inclusion.

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NGSS.MS-ESS1-4

What is an extrusion?

• a break in the Earth's crust

• a rock within a rock

• magma that has cooled and hardened below the surface

• magma that pushes up to the surface and then cools and hardens on the surface

What is an inclusion?

• a break in the Earth's crust

• magma that cools and hardens below the surface

• magma that hardens on the surface

• a rock within a rock

Determining the absolute age of a rock is done

• by comparing older and younger rock layers.

• by radioactive dating.

• using the law of superposition.

• using index fossils.

Geologists believe that Earth is about

• a million years old.

• 4.6 million years old.

• 4.6 billion years old.

• 4.6 trillion years old.

Tags

NGSS.MS-ESS1-4

Is P older than M?

• Yes because M is tilting down.

• Yes, because M is on both sides of P.

• No, because P is an intrusion that cuts through the rock layers.

• No, because it is not possible to figure it out.

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NGSS.MS-ESS1-4

Index fossils are the fossils of organisms that lived for a short period of time and are found in many places. They are useful for figuring out

• how many species lived on Earth.

• the relative age of rock layers.

• the absolute age of rock layers.

• the age of Earth.

Tags

NGSS.MS-ESS1-4