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MC |
7th Grade Integrated Science |
Standard: 02 |
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Objective: 02. Analyze how density affects Earth’s structure. |
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ILO: |
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Which answer shows the following items in order from the highest density to the lowest density?
a. water, atmosphere, core, crust
b. atmosphere, crust, core, water
c. crust,
water, atmosphere, core
d. core, crust, water, atmosphere
Correct
Answer: d
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MC |
7th Grade Integrated Science |
Standard: 02 |
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Objective: 02. Analyze how density affects Earth’s structure. |
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ILO: |
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Pat is given
the following items: a rock, sand,
water, and metal bar. Pat calculates
the density of each object . The
results are shown below:
Rock = 3.2
g/mL
Sand = 1.9
g/mL
Water =
1.0g/mL
Piece of metal
= 6.5 g/mL
Pat then puts
all of the items into a jar and shakes it up. Pat lets the jar settle for 5
minutes,
What would be
the expected order of the items going from the top of the container to the
bottom?
a. rock, sand, water, metal
b. metal, rock, sand, water
c. water, sand, rock, metal
d. sand, metal, water, rock
Correct
Answer: c
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MC |
7th Grade Integrated Science |
Standard: 02 |
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Objective: 02. Analyze how density affects Earth’s structure. |
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ILO: |
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Water has a
density of 1.0 g/mL. You are given a
rock with a density of 2.5 g/mL.
Predict what will happen to the rock when put into a container of water.
a. The rock will sink to the bottom of the
water.
b. The rock will float on top of the water.
c. The rock will sink half way to the bottom of
the water.
d. The rock will float just below the surface
of the water.
Correct
Answer: a
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MC |
7th Grade Integrated Science |
Standard: 02 |
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Objective: 02. Analyze how density affects Earth’s structure. |
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ILO: |
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Why is water
located above the crust but below the air?
a. The density of water is higher than air and
higher than the crust
b. The density of water is lower than air and
higher than the crust.
c. The density of water is higher than air and
lower than the crust.
d. The density of water is lower than air and
lower than the crust.
Correct Answer:
b
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MC |
7th Grade Integrated Science |
Standard: 02 |
|
Objective: 02. Analyze how density affects Earth’s structure. |
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ILO: |
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You are given an
unknown object. You find its mass to be
28g. You find its volume to be 10
mL. Using the chart below, determine which layer of the Earth the object would
belong to based on its density.
Sample Earth
density chart:
Layer Approximate Density
|
Water |
1.0 g/mL |
|
Crust |
2.7 – 3.0 g/mL |
|
Mantle |
3.3 – 5.7 g/mL |
|
Outer Core |
9.0-12.0 g/mL |
|
Inner Core |
12.7 – 13.0 g/mL |
Which layer of
the Earth would the unknown object belong to based on its density?
a. Crust
b.
Mantle
c.
Outer Core
d.
Inner Core
Correct Answer: a
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MC |
7th Grade Integrated Science |
Standard: 02 |
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Objective: 02. Analyze how density affects Earth’s surface. |
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ILO: |
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Which of the following statements best explains why earth is layered in the following order:
air à water à crust à core?
a. Things in nature like to order themselves by color, red to the bottom and blue to the top.
b. Things in nature like to order themselves by density, most dense to the bottom and least dense to the top.
c. Things in nature like to order themselves by particle size, largest particles to the bottom and smallest particles to the top.
d. Things in nature like to order themselves by temperature, hottest to the bottom and coolest to the top.
Correct Answer: b
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MC |
7th Grade Integrated Science |
Standard: 02 |
|
Objective: 02. Analyze how density affects Earth’s structure. |
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ILO: |
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Why does the
atmosphere of the Earth float above the planet’s surface?
a. The atmosphere has a higher density than the
planet.
b. The atmosphere has a lower density than the
planet.
c. The atmosphere formed before the planet did.
d. The atmosphere formed after the planet did.
Correct
Answer: b
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MC |
7th Grade Integrated Science |
Standard: 02 |
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Objective: 02. Analyze how density affects Earth’s structure. |
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ILO: |
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Why are iron and
nickel found in Earth’s core?
a. They have a higher density than most of
Earth’s substances.
b. They have a lower density than most of
Earth’s substances.
c. The core is hotter than the other layers of
the earth.
d. The core is colder than the other layers of
the earth.
Correct Answer:
a
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I |
7th Grade Integrated Science |
Standard: 02 |
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Objective: 02. Analyze how density affects Earth’s structure. |
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ILO: |
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You are given
the following materials and their densities and then asked to construct a model
of the earth consisting of a core, mantle, crust, water, and air.
|
Cotton |
0.2 g/mL |
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Glue |
1.0 g/mL |
|
clay |
1.8 g/mL |
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Aluminum foil |
2.4 g/mL |
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A Nickel |
4.6 g/mL |
1. Based on density, which material would be
the best choice to represent the core
of the Earth?
a.
cotton
b.
clay
c. aluminum foil
d.
nickel
2. Based on density, which material would be
the best choice to represent the crust
of the Earth?
a.
cotton
b.
clay
c. aluminum foil
d.
nickel
Correct
Answers:
1. d
2.
b
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E |
7th Grade Integrated Science |
Standard: 02 |
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Objective: 02. Analyze how density affects Earth’s structure. |
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ILO: |
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Given the model
of the Earth shown above, write a short paragraph explaining whether or not
this is a good model of the Earth or a poor model of the Earth. Cite reasons that will help to defend your
answer.
Sample Answer:
This is a poor
model of the Earth. This model only
shows two different layers. Most
scientists agree that the Earth consists of more than one interior layer. The interior layers should be further
divided into separate layers. This
model also attempts to show mountain ranges.
The mountain ranges are way out of proportion to the planet. Etc.
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E |
7th Grade Integrated Science |
Standard: 02 |
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Objective: 02. Analyze how density affects Earth’s structure. |
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ILO: |
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Explain crustal movement by
comparing the density of earth's continental crust to ocean crust as evidence.
Ideal Answer: Crustal
rock balances on top of the mantle because the mantle is denser than the crust.
Since, continental crust is less dense then ocean crust, it balances higher
than ocean crust on the mantle.
Scoring Guide:
Explanation of how isostasy relates
to density-40%
Comparing density of crusts-40%
Spelling, punctuation, language
usage-20%
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P |
7th Grade Integrated Science |
Standard: 02 |
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Objective: 02. Analyze how density affects Earth’s structure. |
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ILO: |
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Purpose – To determine if the student can calculate the density of
a given object and place it in the right layer of the Earth.
What - The student will calculate the density of an object using
the appropriate tools. Once the density
is calculated the student will infer as to which layer of the Earth the object
would belong based only on its density.
Materials needed:
an object to measure (small pebble or other), tools to calculate mass
and volume, chart showing relative densities of the layers of the Earth.
Sample Earth
density chart:
Layer
Approximate Density
|
Water |
1.0 g/mL |
|
Crust |
2.7 – 3.0 g/mL |
|
Mantle |
3.3 – 5.7 g/mL |
|
Outer Core |
9.0-12.0 g/mL |
|
Inner Core |
12.7 – 13.0
g/mL |
How - The student will be given a small object and the materials
needed to calculate its density. After finding the mass and volume, the student
will calculate density using d=m/v.
Once the density is known the student will use that data and the Earth
density chart to determine which layer of the Earth has the closest density to
the object.
Scoring – There are 4 parts to be evaluated.
First – did the
student find the right mass?
Second – did the
student find the correct volume?
Third – did the
student calculated density correctly?
Fourth – did the
student correctly interpret the chart and choose the correct layer of the
Earth?
|
|
Mass |
Volume |
Density |
Earth/Layer |
|
Object #1 |
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Object #2 |
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Object #3 |
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Object #4 |
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P |
7th Grade Integrated Science |
Standard: 02 |
|
Objective: 02. Analyze how density affects Earth’s structure. |
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ILO: |
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Using
Density to Determine Earth's Interior
TEACHER'S DIRECTIONS
Materials: Samples of iron, granite and basalt, Balance, beaker or graduate
cylinder, water, calculators
Ideal answers:
2b. Basalt's density should be
between the density of iron and granite.
2c. Because the sample of iron had
the highest density of the three samples, it most likely would be in the
core. The continental crust then would
most likely be made of granite, as it was the lowest of the densities. Oceanic
crust is denser than continental crust, which means it most likely would be
made of basalt.
Scoring
Guide Rubric
Response
|
Criteria |
Rating |
Exemplary
|
Responses
concise, accurate densities, uses data to form answers, shows clear
understanding of procedures |
6 |
|
Competent |
Response is
fairly clear, acceptable density calculations, procedures completed
acceptably |
5 |
|
Minor flaws |
Completes
procedures satisfactorily, some explanations unclear, conclusions do not use
data |
4 |
|
Nearly
Satisfactory |
Begins
assignment satisfactorily, omits significant steps in procedure,
inappropriate use of data |
3 |
|
Fails to
complete answers |
Experiment and
explanations not clear, major flaws in density procedure |
2 |
|
Unable to begin
effectively |
Explanations,
density procedures not correct, does not understand how to do experiment, not
successfully completed |
1 |
|
No attempt |
Does not begin
or try to complete |
0 |
Using Density to Determine Earth's Interior
STUDENT WORKSHEET
1. Obtain a sample of iron and a
sample of granite. Determine the density of each sample using the formula;
Density = Mass/ Volume
Iron
density = __________________
Granite density =
___________________
2.a. Now, obtain a sample of basalt
and determine the density of that sample.
Basalt density =
____________________
b. How does the density of basalt
compare to iron and granite?
c. Using the densities you
determined for iron, basalt and granite, which sample would mostly likely be
found in the core of the earth? Which
one would be in continental crust?
Ocean crust?
|
P |
7th Grade Integrated Science |
Standard: 02 |
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Objective: 02. Analyze how density affects Earth’s structure. |
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|
ILO: |
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Developing
a Model of Earth
TEACHER'S
DIRECTIONS
Materials needed:
• candy
coated peanuts or oranges for each student
• materials
for students to construct models:
• modeling
clay, fruit, styrofoam, etc.
• student
worksheets
Ideal Answers & Scoring Guide:
1. Answers will vary, but probably
will include the layers similar to Earth.
2.
|
Similarities |
Differences |
|
a. thin crust |
all solid layers |
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b. mantle present |
no inner core |
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c. core present |