Week 4 Homework
Assigned March 31st, DUE April 4th
Name:___________________
Class PD:________
Part One: Rock Cycle
1. As a volcano erupts, it produces lava. As this lava flows, it cools down and hardens forming a rock.
How could you classify this rock? Answer: __________________________
2. Sometimes fossils can be found in sedimentary rocks. Which statement best explains why?
a. Heat and pressure from deep within Earth cause fossils to form
b. The remains of dead plants and animals settle to the bottom of the ocean or lake and are
covered by mud. Pressure eventually forms these layers into rock .
c. Lava may flow over an animal or plant, and as it cools and hardens, a fossilized rock is
formed.
d. Larger rocks are slowly eroded away by the elements on Earth.
3. A metamorphic rock can also be thought of as a rock that changes. What causes the rock to
change?
a. Layers of sediment building up over time and pressing down forming rock.
b. Raind, wind, freezing, thawing, and plant roots growing cause the rock to erode away
leaving behind sediments.
c. Extreme heat and pressure from deep within Earth causes changes to the rock’s
appearance, structure, and composition.
d. The rock slowly changes over time into a new rock .
4. What is similar about igneous rock and metamorphic rock formation?
a. Their formation requires extreme heat.
c. they both look the same when formed
b. Their formation occurs deep underground.
D. both have layers
5. What is the primary process that turns sediments into sedimentary rocks?
a. Organisms walking on layers of sediment, pressing particles together tightly
b. Minerals within sediment, absorbing water, and undergoing a chemical reaction
c. Upper layers of sediment, pressing down on lower layers of deposited sediment
d. Magma cooling under the surface of Earth, crystallizing to form rock
6. Which of the following processes is one of the early steps in the formation of sedimentary rock?
a. Weathering of existing rock
b. Crystallization of molten minerals
c. Melting of rock in volcanoes
d. Chemical reactions that produce heat
7. How is the formation of metamorphic rocks different from the formation of igneous rocks?
a. ______________________________________________
8. Sedimentary rock can be changed into igneous if sediments are
a. Compacted
c. weathered
b. Depostited
d. melted
9. Igneous rock can be changed into sedimentary rock when igneous rocksa. That form in mountains get pushed together
b. are weathered and the fragments deposited
c. melt to form layers of different materials
d. put out by volcanoes create new land
Part Two: Layers of Earth
1. Fill in the blank of the following statements using the work bank below:
inner core, mantle, lithosphere, asthenosphere, plasticity, outer core
The asthenosphere has _________________________, the characteristic that allows the layer
to bend, flex, and stretch such as playdoh.
The _________________________ is composed of iron and nickel in a liquid state.
The _________________________ contains molten material that moves due to large amount of
heat inside Earth.
The _________________________ is a thin, rocky layer that is broken into separate moving
plates.
2. Earth’s crust would be best modeled by using a material that is –
a. Liquid and hot
c. Soft and flexible
b. Dense and smooth
d. Thin and solid
3. Which of Earth’s layers has the lowest density?
a. Crust
c. Mantle
b. Inner core
d. Outer Core
4. Which of the following best describes the position of the layer of earth know as the outer core?
a. Above the mantle, which is above the core
b. Above the core, below the mantle
c. Between the inner core and mantle
d. Below all other layers, including the mantle and core
5. Kody bit a peanut M&M in half and noticed that there was a colored candy layer, a thicker layer
of chocolate stuck to the colored layer, a mushier chocolate layer, and the solid peanut in the
middle. She decided this would NOT be a good model for the layers of Earth because it doesn’t
properly show:
a. The order of the layer
b. The thickness of each layer
c. Which layers are solid
d. The outer core
6. Which layer of Earth is a dense solid from being packed together tightly?
a. Asthenosphere
b. Crust
c. Inner core
d. Lithosphere
7. Which layer of Earth is made of liquid metal?
a. Mantle
b. Crust
c. Inner core
d. Outer core
8. Which of the following lists the Earth’s layers in order from inside to outside/
a. Mantle, crust, outer core, inner core
b. Crust, mantle, outer core, inner core
c. Outer core, inner core, mantle, crust
d. Inner core, outer core, mantle, crust
Part Three: Tectonic Plates
1. What type of boundary do you have when plates collide? _______________
2. What type of boundary do you have when two plates slide past each other?
_______________
3. What type of boundary do you have when two plates are moving away from each other?
_______________
4. Subduction of the ocean floor takes place at a _______________.
a. Trench
b. Mountain range
c. Tsunami
5. When two plates slide past each other at a transform boundary an _______________
occurs.
6. What two processes could result in the formation of high mountains with well-rounded peaks?
a. Collisions of continental plates and wind
b. When a dense plate subducts below a less dense plate as they converge
c. Collisions of oceanic plates
d. Collisions of continental plates and erosion
Use the map below to answer the questions that follow.
7. The Nazca and South American plate plate boundary is…
a. Convergent
b. Divergent
c. Transform
8. The South American and African plate boundary is…
a. Convergent
b. Divergent
c. Transform
9. The Eurasian and Indo-Austrailian plate boundary is…
a. Convergent
b. Divergent
c. Transform
10. The Nazca and Pacific plate boundary is…
a. Convergent
b. Divergent
c. Transform
11. The plate boundary located off the western coast of South America is most likely an area of…
a. Convergent
b. Subduction
c. Transform
12. What type of plate boundary is occurring between the Eurasian plate and the Indo-Australian
plate?
a. Convergent
b. Divergent
c. Transform
13. A mid-atlantic ridge is located between which two plates?
a. South American and Nazca
b. North American and Eurasian
c. Pacific and Phillipine Plate
Use the diagram below to answer the questions that follow.
14. At location 1 lava is rising to the top because it is ____________ dense than the surrounding
material.
15. At which location will you find the newest rocks? ____________
16. At location 3 the continental crust rises above the oceanic crust because it is
____________ dense.
17. ________________ of the oceanic plate is occurring at location 4 and this forms a trench.
18. At location 5 the continental crust is colliding or at a __________________ plate boundary
with the oceanic crust.
19. At location 6 the oceanic crust is being ________________ into the mantle and is being
melted or destroyed.
Part Four: General Questions
1. What was the name of the supercontinent discovered by Alfred Wegener? ____________
2. A 25.5g sample of rock has a volume of 5cm3. What is its density?
3. A 12.6g sample of rock has a volume of 2cm3. What is its density?