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6th grade science unit 3 Earth's Comp and Changes posttest 25-26 DUE: Dec 19 — 24 Questions
Armstrong, Kennedee

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Forming a Supercontinent
Read the passage and answer the following question(s).

Forming a Supercontinent

Scientists use data from fossils, rocks and other land formations to better understand how Earth has changed over time. They have analyzed evidence to understand how the supercontinent Pangaea became the continents known today. The diagram shows Pangaea (Pangea).

The diagram shows the modern-day continents that made up Pangea. Mountains are located on the east coast of North America, the west coast of Europe, the south coast of Africa, and a tiny section of the east coast of South America.

The continents and subcontinents are on different tectonic plates that move slowly over time. Adjacent plates move along the plate boundaries, or edges. Divergent boundaries occur when two plates move away from each other. Convergent boundaries occur when plates move toward each other. These boundaries are predicted to be the cause of the physical features that are observed today, and how the continents came to exist. Similar physical features and rock formations can be found on continents that are now separated by oceans. The diagram shows the different plates on Earth.

The different plates on Earth are the Pacific Plate, the Juan de Fuca Plate, the Cocos Plate, the Nazca Plate, the North American Plate, the South American Plate, the Caribbean Plate, the African Plate, the Arabian Plate, the Indian Plate, the Australian Plate, the Philippine Plate, the Eurasian Plate, and the Antarctic Plate. The Appalachian mountains are along the east coast of North America, and the Caledonian mountains are along the west coast of Europe.

Similar fossils have also been found on different continents. The table shows where three of these fossils were found.

Species Relative age of Rocks (millions of years ago) Location
Cyngnonathus 200 mya South America, Africa
Glossopteris 300 mya South America, India, Australia, Antarctica, Africa
Listrosaurus 300 mya Africa, India, Antartica
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Question 7.



The diagram shows the plate boundary between the Nazca Plate and the South American Plate.

The image shows the Nazca Plate, The Andes Mountains, and the South American Plate. The Andes Mountains are located along the western coast of South America.

Which is true about the Nazca Plate and the South American Plate?


The Nazca plate is oceanic crust, and the South American Plate is continental crust. The plates most likely diverged and formed the Andes Mountains.


The Nazca plate is continental crust, and the South American Plate is oceanic crust. The plates most likely diverged and formed the Andes Mountains.


The Nazca plate is oceanic crust, and the South American Plate is continental crust. The plates most likely converged and formed the Andes Mountains.


The Nazca plate is continental crust, and the South American Plate is oceanic crust. The plates most likely converged and formed the Andes Mountains.



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Answer 1

Correct answer: "The Nazca plate is oceanic crust, and the South American Plate is continental crust. The plates most likely converged and formed the Andes Mountains."

Explanation: The denser oceanic Nazca Plate is subducting beneath the less dense continental South American Plate. This convergent boundary caused uplift and volcanic activity that formed the Andes.