Twig 4th Grade Mod 3 Review

Twig 4th Grade Mod 3 Review

The rocks at the bottom of the Grand Canyon are the oldest.

The Grand Canyon

Multiple Choice

What fossil did scientists find at the bottom layer of the canyon?

• trilobite

• shark tooth

• shark baby

• footprints

Multiple Choice

What fossil did scientists find at the top layer of the canyon?

• trilobite

• shark tooth

• shark baby

• footprints

Multiple Choice

Was the Grand Canyon always a desert landscape?

• Yes

• No

This layer is about 515 million years old. Sediment was brought here and deposited.

This layer was underwater. Many animals lived in this sea.​

The Bright Angel Shale

Changes to the planet can be quick, deadly, and catastrophic or slow and unnoticeable

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Multiple Choice

Is the landscape only changing because of nature?

• Yes, natural things like tornados and hurricanes

• No, humans are capable of changing the land

• Humans are the only reason nature is changing

• Nature does everything on its own

Multiple Choice

Are the Great Lakes made by a quick change or a slow change?

• quick

• slow

Weathering

Definition

the process of wearing or being worn by long exposure to the atmosphere.

Erosion

Definition

the process of eroding or being eroded by wind, water, or other natural agents.

Multiple Choice

Ture or false. Water is the only cause of erosion.

• True

• False

The glacier activity

Open Ended

What were the 2 types of glaciers we modeled in class?

Open Ended

What happened when we pushed the plain glacier on the sand?

Poll

True or False. The rock glacier left pieces of it behind as it pushed down.

• True

• False

Multiple Choice

True or False. The rock glacier scratched up the clay surface.

• True

• False

Multiple Choice

True or False. The plain glacier moved more easily on the sand than on the clay.

• True

• False

When the glacier pushed on the sand

When the glaciers pushed on the sandy surface, it left some water behind it. It also pushed the sand around it. It disturbed the land. It also pushed a lot of the sand to the front. This is modeling SEDIMENT. Water carries SEDIMENT down. It can also collect it too and not stay plain.

Some text here about the topic of discussion

Poll

Do you think oceans and streams are continuing to change the landscape today?

• Yes

• No

Erosion can take millions of years to see the change. No human has ever witnessed it happening.​

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Erosion

Erosion and changes are also affecting manmade structures. The Great Wall of China is one example. Naturally, the wind and rain erodes part of it. But can humans do to change it?

Great Wall of China

Poll

Are you ready for the test?

• Yes, thank you for the review!

• No, but I will try my best.