Section 26.1 The Sun

The term 'Core' is defined as:

• The outermost layer of the Earth

• The central or most important part of something

• A type of fruit

• A mathematical concept

Build Vocabulary: Define the term 'Radiation zone'.

• A region of a star where energy is primarily transported by radiation.

• A layer of the Earth's atmosphere where radiation is absorbed.

• A zone in a nuclear reactor where radiation is generated.

• A part of the electromagnetic spectrum associated with radiation.

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NGSS.HS-ESS1-1

Build Vocabulary: Define the term 'Convection zone'.

• A region of a star where energy is primarily transported by convection.

• A layer of the Earth where tectonic plates are located.

• A zone in the ocean where water temperature changes rapidly with depth.

• A part of the atmosphere where weather phenomena occur.

The sun gives off a large amount of energy in the form of __________ radiation.

• electromagnetic

• thermal

• nuclear

• mechanical

Circle the letter of each sentence that is true about nuclear fusion in the sun.

• Less massive nuclei combine into more massive nuclei.

• The end product of fusion is hydrogen.

• Fusion is a type of chemical reaction.

• Hydrogen nuclei fuse into helium nuclei.

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NGSS.HS-ESS1-1

For the sun to be stable, inward and outward forces within it must be in __________.

• equilibrium or balance

• chaos

• disorder

• randomness

Is the following sentence true or false? The sun remains stable because the inward pull of gravity balances the outward push of thermal pressure from nuclear fission.

• True

• False

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NGSS.HS-ESS1-1

Which is not a layer of the sun’s interior.

• the radiation zone

• the photosphere

• the convection zone

• the core

Which is not a way that energy moves through the sun.

• gravity

• convection

• radiation

• nuclear fusion

List the layers of the sun’s interior shown on the diagram.

• a. Convection zone b. Radiation zone c. Core

• d. Photosphere e. Chromosphere f. Corona

• g. Mesosphere h. Thermosphere i. Exosphere

• j. Troposphere k. Stratosphere l. Ionosphere