The Structure of Earth Classwork Name: Classwork #1content.njctl.org/courses/science/4th-grade-science/the... th4 Grade PSI History of Planet Earth Answer Key The Structure of Earth

www.njctl.org 4th Grade PSI History of Planet Earth

The Structure of Earth Classwork Name: __________________________ Classwork #1 4th grade PSI

1. In your own words, what is the Earth’s crust? ________________________________________________

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2. The Earth’s surface became the way it is:

A. only very recently.

B. because of one event in history.

C. over many hundreds of thousands of years.

D. over many years, but now it is done changing.


The Structure of Earth Homework Name: __________________________ Homework #1 4th grade PSI

1. Label the three layers of Earth. ___________________ ___________________ ___________________

2. Geologists study rocks in Earth’s crust to learn about:

A. property lines

B. history

C. languages

D. what is happening right now

3. Why do you think it might be important to learn about Earth’s history? (Be as specific as you can.)

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Rock Layers Classwork Name: __________________________ Classwork #2 4th grade PSI

1. Sediment is: (choose the best answer)

A. dirt and rock

B. solid materials

C. broken up particles that sink in water

D. not common in sedimentary rocks

2. In your own words, what does the Law of Superposition say? ________________________________________________

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Rock Layers Homework Name: __________________________ Homework #2 4th grade PSI

1. Draw a picture or use words to describe the steps in

sedimentary rock formation. If drawing pictures, use labels where appropriate. ________________________________________________ deposition ________________________________________________ sedimentation ________________________________________________ compaction ________________________________________________ cementation

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Fossils and Relative Time Classwork Name: __________________________ Classwork #3 4th grade PSI

1. What is a fossil?

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2. Fossils found in rocks from different time periods look

different because:

A. fossil deposition is random

B. different plants and animals lived at different times

C. the same plants and animals have always existed but

move around

D. the Earth has not changed


Fossils and Relative Time Homework Name: __________________________ Homework #3 4th grade PSI

Use the diagram below to answer questions 3 and 4.

very long ago recent

1. You have 2 rocks.

In Rock A, you find 3 fossils and one fossil. In Rock B you find 2 fossils. Which rock is older? Why?

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2. In Asia and South America, rocks have been found with

many fossils. Given your knowledge of fossils, how can you compare or contrast these rocks?

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Rock Formation and Earth Forces Classwork Name: _____________________ Classwork #4 4th grade PSI

1. Rocks that are closer to the surface are always younger than

rocks that are deeper down.

TRUE FALSE

2. What are some examples of Earth forces that can disrupt the Law of Superposition?

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Rock Formation and Earth Forces Homework Name: _____________________ Homework #4 4th grade PSI

1. What are tectonic plates?

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2. A friend tells you that tectonic plates are like a broken

eggshell. Explain this statement. (If you want, draw a picture to help explain.) ________________________________________________

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3. Another friend tell you that tectonic plates are like graham

crackers floating on top of yogurt. Explain this statement. (If you want, draw a picture to help explain.) ________________________________________________

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Tectonic Plates Classwork Name: ______________________________ Classwork #5 4th grade PSI

1. Fill in the chart to compare oceanic and continental crust.

oceanic crust continental crust


Tectonic Plates Homework Name: ______________________________ Homework #5 4th grade PSI

1. What type of plate boundary does this

diagram show? What do plates do at this kind of boundary? ________________________________________________

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Earth’s Visible Features Classwork Name: ______________________________ Classwork #6 4th grade PSI

1. Draw three pictures in the boxes below that show three different features you might

find on Earth where plates converge. (Think about differences between oceanic and continental crust.)

Continental-continental convergence

Continental-oceanic convergence

Oceanic-oceanic convergence


Earth’s Visible Features Homework Name: ______________________________ Homework #6 4th grade PSI

1. What features would you see on Earth’s surface where

tectonic plates diverge? ________________________________________________

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2. At divergent boundaries, what fills the space that is left by plates pulling apart? Where does it come from?

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3. What is subduction and where does it occur?

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Patterns of Earth’s Features Classwork Name: __________________________ Classwork #7 4th grade PSI

1. What does this map of earthquake locations show us?

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2. Do volcanoes exist in the same locations where earthquakes occur? Explain.

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Patterns of Earth’s Features Homework Name: __________________________ Homework #7 4th grade PSI

1. Volcanoes form at what type of plate boundaries?

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2. Circle all of these types of boundaries on this map.


Answer Key

The Structure of Earth Classwork Classwork #1

1. Answers will vary (outer layer of earth, Earth’s surface, what we see with our eyes, sedimentary rocks, important in teaching us about history)

2. C The Structure of Earth Homework Homework #1

1. crust mantle core

2. B 3. Answers will vary

Rock Layers Classwork Classwork #2

1. C 2. Answers will vary, but must have the idea that as you go farther from Earth’s

surface, rocks get older and/or as rocks are closer to Earth’s surface, they are younger.

Rock Layers Homework Homework #2

1. Answers will vary but should include the following ideas:

deposition: sediments are dropped somewhere, from moving to standing

still

sedimentation: build up in layers

compaction: sediments squash layers below as they build up

cementation: rocks are hardened, air is squeezed out

Fossils and Relative Time Classwork Classwork #3

1. Answers will vary (remains of plants and animals, non-living organisms found in rocks, found in sedimentary rocks)

2. B


Fossils and Relative Time Homework Homework #3

1. Rock A is older than Rock B because Rock A contains fossils that are older than Rock B.

2. These rocks must have formed at a similar time in history because they both contain fossils that are similar in age.

Rock Formations and Earth Forces Classwork Classwork #4

1. false 2. earthquakes, erosion (wind, water, animals), rivers

Rock Formations and Earth Forces Homework Homework #4

1. Answers will vary (pieces of earth crust that fit together, sections of Earth’s surface, thick pieces that float on the mantle)

2. Answers should discuss earth’s surface being broken into pieces that fit together. 3. Answers should discuss how plates float on top of a liquid mantle.

Tectonic Plates Classwork Classwork #5

Oceanic Crust Continental Crust

under the ocean floor made of dense rocks heavy about 4 miles thick

under land masses made of light rocks, lighter 6 - 47 miles thick usually older

Tectonic Plates Homework Homework #5

1. divergent boundary, plates move away from one another, new crust is formed 2. transform boundary, pates slide past each other in opposite directions 3. convergent boundary, plates push together, one plate subducts under the other

Earth’s Visible Features Classwork Classwork #6

Continental-continental

convergence

Continental-oceanic convergence

Oceanic-oceanic convergence

picture should show mountains forming

picture should show oceanic plate subducting and mountains forming

picture should show an ocean trench forming and

one plate subducting


Earth’s Visible Features Homework Homework #6

1. Rift valleys or mid-ocean ridges 2. Magma. It comes from the mantle. 3. Subduction is where one plate sinks underneath another. It happens at

convergent boundaries. Patterns of Earth’s Features Classwork Classwork #7

1. The map shows that earthquakes occur on plate boundaries and do not happen in random places across the globe.

2. Volcanoes exist in some locations where earthquakes occur, but not all. Volcanoes are located at converging boundaries while earthquakes can be at any kind of boundary.

Patterns of Earth’s Features Homework Homework #7

1. convergent boundaries

2.

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The Structure of Earth Classwork Name: Classwork #1content.njctl.org/courses/science/4th-grade-science/the... th4 Grade PSI History of Planet Earth Answer Key The Structure of Earth