The Sun C3 5

Why is the Sun important to Earth?

• It provides heat and light

• It is the largest star in the universe

• It helps Earth form new stars

What is the composition of the Sun?

• 75% hydrogen, 25% helium, 0.1% oxygen and carbon

• 50% hydrogen, 50% helium

• 100% hydrogen

What are solar flares?

• Explosions on the Sun's atmosphere

• Temporary disturbances on the Sun's surface

• Light emissions from stars

What is the current solar cycle the Sun is in?

• Solar Cycle 24

• Solar Cycle 18

• Solar Cycle 30

What are sunspots?

• Temporary disturbances on the Sun’s surface

• Areas of cold space

• Explosions on the Sun’s surface

What is the solar maximum?

• A phase with maximum number of sunspots and solar flares

• A time when the Sun is inactive

• A time when the Sun is cold

What happens during the solar minimum?

• There are fewer sunspots and solar flares

• The Sun produces more light

• The Sun’s energy decreases dramatically

What causes auroras on Earth?

• Solar radiation interacting with Earth's atmosphere

• The collision of stars

• The cooling of the Sun's surface

Where are auroras visible?

• Near the equator

• Near the north and south poles

• In the desert

What does sunlight give to help the human body activate?

• Vitamin C

• Vitamin B

• Vitamin D