Xenoliths ELA7 Practice

PART A: How does paragraph 3 of "Xenolith" most contribute to the article as a whole?

• It compares the characteristics of xenoliths and xenocrysts.

• It highlights the location where xenoliths can be found.

• It describes the process of how xenoliths are formed.

• It emphasizes the size and shape of xenoliths and xenocrysts.

PART B: Select one paragraph that contributes to the article in a similar way as paragraph 3.

It describes the process of how xenoliths are formed.

• Paragraph 5

• Paragraph 6

• Paragraph 7

• Paragraph 8

PART A: According to "Xenolith," what effect does temperature have on xenoliths?

• They become more visible as the hot lava erupts or flows from Earth's surface.

• They transform into meteorites if they become too heated while crashing into Earth.

• They form xenocrysts if they become too cool because of the surrounding air or water.

• They develop different characteristics if exposed to extremely hot temperatures.

PART B: Which evidence from the article supports the answer to Part A?

They develop different characteristics if exposed to extremely hot temperatures.

• "Xenoliths are different types of rock embedded in igneous rock" (par. 2).

• "These bits and pieces, trapped in the magma but not melting into it, become xenoliths" (par. 3).

• "A xenolith may lose its unique qualities if it melts into the surrounding magma" (par. 5).

• "The xenoliths in meteorites were formed from collisions with other objects outside the Earth's atmosphere" (par. 8).

PART A: How do xenoliths and xenocrysts help scientists understand the Earth?

• by revealing the chemical properties of the Earth's mantle

• by exposing the conditions deep within the Earth's crust

• by demonstrating why lava cools quickly at the Earth's surface

• by displaying how the Earth's atmosphere is affected by collisions with meteorites

PART B: Which detail from the article provides evidence for the answer to PART A?

by exposing the conditions deep within the Earth's crust

• "Magma rises to the Earth's surface through these pipes between the Earth's crust and mantle" (par. 3).

• "As magma erupts or flows from the Earth's surface, it is cooled by exposure to air or water" (par. 4).

• "Some of the features studied by geologists are temperature, pressure, construction, and movement within the Earth's surface" (par. 7).

• "The xenoliths in meteorites were formed from collisions with other objects outside the Earth's atmosphere" (par. 8).

PART A: As used in paragraph 2 in "Xenolith," what does the word embedded mean?

• enclosed

• eroded

• melted

• created

PART B: Which of the following phrases from the article helps the reader understand the meaning of the word embedded (enclosed)?

• "...trapped in another type of rock" (par. 1).

• "...molten rock beneath the Earth's crust..." (par. 2).

• "...emerges as lava during a volcanic eruption" (par. 2).

• "...torn from deep cracks..." (par. 3).

PART A: Which statement includes two central ideas of "Xenolith"?

• Xenoliths exist only in igneous rock and can help explain where meteorites come from.

• Xenoliths are usually formed by magma and are encased in other rock types.

• Xenoliths and xenocrysts look like sand and can give useful information about the Earth's atmosphere.

• Xenoliths and xenocrysts can be found in all types of rock and can help explain how sedimentary rock is formed.

PART B: Which detail best supports the answer to Part A?

Xenoliths are usually formed by magma and are encased in other rock types.

• "...a xenolith is a rock embedded in magma while the magma was cooling" (par. 2).

• "Xenoliths can be as small as a grain of sand or as large as a football..." (par. 4).

• "Xenoliths and xenocrysts are affected by temperature" (par. 5).

• "Xenoliths and xenocrysts are often identified by the names of the two rock types involved" (par. 6).