Chapter 12 Lesson 2 Review

What is nuclear fusion?

• The process where atoms split apart

• The process where nuclei of several atoms combine to form one larger nucleus

• The process where electrons are shared between atoms

• The process where molecules are broken down into atoms

What happens to atoms as they get hotter?

• They move more slowly

• They stop moving

• They move more quickly

• They become larger

What is released during nuclear fusion?

• Light

• Sound

• Tremendous amount of energy

• Water

What is the photosphere?

• The outermost layer of the sun

• The innermost layer of the sun

• The visible surface of the sun

• The core of the sun

What is the primary composition of most stars, including the Sun?

• Oxygen and nitrogen

• Carbon and oxygen

• Hydrogen and helium

• Iron and nickel

What process occurs in the core of a star that generates energy?

• Nuclear fission

• Nuclear fusion

• Chemical reaction

• Combustion

Which layer of a star is described as a shell of cooler hydrogen above the core?

• Convection zone

• Radiative zone

• Photosphere

• Corona

What makes it easy for scientists to study and observe the Sun?

• Its small size

• Its proximity to Earth

• Its low temperature

• Its unique color

How many outer layers make up a star's atmosphere?

• One

• Two

• Three

• Four

What is the apparent surface of a star called?

• Chromosphere

• Corona

• Photosphere

• Sunspot