The Sun and Stars Test

About 75% of the sun's mass is _______.

• Helium

• Oxygen

• Hydrogen

• Carbon

The process by which nuclei of small atoms combine to form a more massive nucleus is called _______.

• Nuclear fission

• Nuclear fusion

• Radioactive decay

• Chemical reaction

Nuclei of hydrogen atoms are the primary _______ for the sun's fusion.

• Byproduct

• Catalyst

• Inhibitor

• Waste

• Fuel

Studies confirm that the sun is fueled by the fusion of _______ into helium.

• Hydrogen

• Carbon

• Oxygen

• Nitrogen

• Lithium

What is the temperature of the sun's core?

• 1,000,000 degrees C

• 10,000,000 degrees C

• 15,000,000 degrees C

• 20,000,000 degrees C

The radiative zone of the sun surrounds which part?

• Core

• Photosphere

• Convective zone

• Corona

The convective zone surrounds which zone?

• Radiative

• Core

• Photosphere

• Corona

The sun's atmosphere has how many layers?

• One

• Two

• Three

• Four

The photosphere is the ________ layer of the sun's atmosphere.

• Outermost

• Innermost

• Middle

• Thickest

Cool areas of about 3,800 degrees C on the sun are known as ________.

• Sunspots

• Solar flares

• Prominences

• Coronal loops