The Center of Earth

The inner core is not molten because–

• A. the heat in the inner core is not intense enough to liquefy metal.

• B. the outer core keeps it cool.

• C. volcanoes allow heat to escape keeping the inner core cool.

• D. pressure from Earth’s mass prevents iron atoms from moving to a liquid state.

______ hypothesized that Earth’s interior was made up of very dense material.

• A. Newton

• B. Darwin

• C. Galileo

• D. Archimedes

What is the best summary of the text?

• A. Scientists say the center of Earth is called the mantel, which comprises about 85% of Earth’s volume.

• B. Samples show that the center of Earth is a hot, dry sphere called the core.

• C. Evidence shows that Earth’s hot, dense center is made up of metal and important for life.

• D. Most people believe that the center of Earth is sphere-shaped and made up of cooled metal.

In paragraph 2, the word composed means–

• A. calm or settled.

• B. made up of.

• C. written or created.

• D. arrange parts in an artistic way.

The two kinds of seismic waves scientists have used to collect data about the core of Earth are–

• A. P-waves and C-waves.

• B. S-waves and P-waves.

• C. M-waves and P-waves.

• D. T-waves and S-waves.

What is one major characteristic about the Earth's core? Use evidence from the text to explain your answer. (RACE)

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Analysis