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This question group is public and is used in 123 tests.

Author: szeiger
No. Questions: 5
Created: Oct 30, 2015
Last Modified: 8 years ago

Science Lunar Eclipse

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Have you ever seen a red moon? It's a sight that usually happens only a couple times a year. What causes a red moon? The ancient Incan people believed that when the moon turned blood-red, it was being eaten by a jaguar. Today we understand that the moon turns red as it passes through the Earth's shadow, or umbra, during a lunar eclipse. For a total lunar eclipse to happen, the Earth, sun, and moon must align precisely. Because it does not happen very often, the sight of a lunar eclipse is as marvelous today as when the ancient Incan people gazed upon it hundreds of years ago.
Grade 8 Supporting Details CCSS: CCRA.R.1, RI.8.1, RST.6-8.1
Based on the information in the article, why is it possible that a person may never see a red moon?
  1. It does not happen frequently.
  2. It is always covered by clouds.
  3. The moon never actually looks red.
  4. The sun covers up the moon.
Grade 8 Author's Purpose CCSS: CCRA.R.6, RI.8.6, RST.6-8.6
The author shared what Incan people believed about the red moon. Why did the author share this information?
  1. to provide a logical explanation for the appearance of the red moon
  2. to explain how people's understanding of the red moon has changed over time
  3. to introduce a story about the history of the red moon
  4. to show how rare the red moon really is
Grade 8 Cause and Effect CCSS: CCRA.R.3, RI.8.3, RST.6-8.1
According to the passage, what causes the moon to turn red?
  1. light reflecting from the sun's surface
  2. a jaguar eating the moon
  3. a change in the moon's chemical composition
  4. passing through the Earth's shadow
Grade 8 Text Elements CCSS: CCRA.R.7, RI.8.7, RST.6-8.7
The author includes a diagram of the text. What does the diagram show?
  1. dates when a red moon will appear
  2. the position of the sun, Earth, and moon during a red moon
  3. how a red moon looks to the human eye
  4. an picture of the red moon from space
Grade 8 Context Clues CCSS: CCRA.R.4, RI.8.4, RST.6-8.4
The author says that for a red moon to appear the Earth, sun, and moon must align precisely. PRECISELY means:
  1. connect in a circle
  2. happens only twice a year
  3. must happen exactly
  4. on top of each other