The energy from the sun is created by a process called:

• nuclear fission
• nuclear fusion
• nuclear reaction
• nuclear core

Energy is created in the core when two _____________ atoms join together to form a ______________ atom.

• helium, hydrogen
• carbon, hydrogen
• nitrogen, helium
• hydrogen, helium

The middle layer of the sun's interior that contains very tightly packed gas is called the _____________.

• photosphere
• chromosphere
• radiation zone
• convection zone

In which area of the sun does gas rise as it heats up, then fall back down as it cools?

• the core
• the radiation zone
• the convection zone
• the corona

When we look at the sun, what layer are we viewing?

• photosphere
• chromosphere
• corona
• convection zone

What layer of the sun's atmosphere gives the sun its "white halo" during a solar eclipse?

• chromosphere
• photosphere
• corona
• atmosphere

The particles of the corona extends into space for millions of kilometers and spreads into streams of electrically charged particles called:

• coronal discharge
• solar flares
• coronal ejection
• solar winds

Areas of gas on the sun's surface that are cooler than gases around them are called:

• corona
• prominences
• sunspots
• solarspots

The number of sunspots on the sun varies in a cycle that is about how long?

• 6-8 years
• 10-11 years
• 12-15 years
• 365 days

Huge loops of reddish gas that connect sunspots are called:

• prominences
• solar flares
• coronal loops
• solar wind