The Sun's Energy

In what form does the Sun's energy travel to Earth?

• Heat
• Electrical energy
• Electromagnetic radiation
• Mechanical energy

What is the distance from the Sun to Earth?

• 150,000 km or 93,000,000 miles
• 1,600,000 km or one million miles
• 15,600,000 km
• 1000 miles

How long does it take the Sun's energy to reach Earth, once it is emitted from the photosphere?

• 100,000 years
• 24 hours
• 28 days
• 8 minutes

Ultraviolet is a kind of electromagnetic radiation emitted by the sun

• True
• False

Gamma radiation is a kind of electromagnetic radiation emitted by the Sun

• True
• Fals

Sound waves are a kind of electromagnetic radiation emitted by the Sun

• True
• False

Infrared is a kind of electromagnetic radiation emitted by the Sun

• True
• False

What protects life on Earth from gamma rays, X rays, and particles emitted by the Sun?

• The ozone layer in the stratosphere
• The ionosphere
• The magnetosphere (Earth's magnetic field)
• Clouds

What protects life on earth from harmful UV (ultraviolet) radiation emitted by the Sun?

• The ozone layer in the stratosphere
• The ionosphere
• The magnetosphere
• clouds

About what percentage of the Sun's radiation is absorbed by land and sea?

• 10%
• 25%
• 50%
• 90%