AnswersVA-Earth Science CRUnit Test

Unit Test — Cumulative exam Answers

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What occurs when Earth’s shadow covers the moon?

A
neap tide
B
spring tide
C
solar eclipse
D
lunar eclipse
22
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Which statement best describes a difference or similarity between a comparative investigation and an experimental investigation?

A
Comparative investigations may be impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations.
B
Comparative investigations involve variables that can be controlled, while experimental investigations allow for the use of a wide range of variables but do not have a control group.
C
Both experimental investigations and comparative investigations are designed to answer scientific questions.
D
Both experimental investigations and comparative investigations focus on making observations rather than collecting new data.
23

Which best explains how scientists confirmed that the moon formed around the same time as Earth?

A
Scientists determined the approximate age of fossils from the moon and Earth.
B
Scientists used radioactive dating to study the age of material from the moon and Earth.
C
Scientists explored the cycle of condensation and evaporation over time on the moon and Earth.
D
Scientists analyzed the content of gases that were part of the atmospheres on the moon and Earth.
24

The histogram shows final exam scores, and the table shows letter grades for each range of scores. A passing grade is 60% or higher.A90–100%B80–90%C70–80%D60–70%

Question illustration
A
Twenty students received As and Bs.
B
Forty students received scores between 40% and 60%.
C
Most students received As and Bs.
D
Most students passed the final exam.
25

Which important event in Earth’s history occurred during the Jurassic period?

T
The first birds emerged on Earth.
M
Mammals were in search of food.
A
Animals with shells emerged on Earth
T
Treelike ferns first began to grow and populate.

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