Which of the Following Statements About Earth's Core Is True

question 7

Multiple Choice

Which of the following statements about Earth's core is true?

• A)Once molten, the core has gradually solidified as it cooled.
• B)P-waves cannot travel through this layer of Earth.
• C)The core makes up about 1/3 of Earth's volume.
• D)The core is mostly made of iron.

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Definitions:

Repressible Genes

Genes whose expression is decreased or halted by the presence of a specific substance, often the end product of the gene's pathway.

Negative Control

An experiment or trial that does not include the factor being tested and is used to ensure that the experiment works by way of comparison.

Gene Regulation

The process of turning genes on and off to ensure that the appropriate genes are expressed at the right times and in the right places.

Eukaryotes

Organisms whose cells contain a nucleus enclosed within a membrane, including animals, plants, fungi, and protists.