Introduction to the Sun and Space CKLA Lesson 1

What is the primary source of energy and heat for life on Earth?

• The Moon

• Other planets

• The Sun

• Stars other than the Sun

What is the term for the first appearance of the sun above the eastern horizon in the morning?

• Sunset

• Noon

• Sunrise

• Twilight

What is the term for the disappearance of the sun below the western horizon in the evening?

• Sunrise

• Midday

• Dawn

• Sunset

What causes the sun to appear to rise and set each day?

• The sun moving around the Earth.

• The Earth's daily rotation.

• The moon's orbit around the Earth.

• Changes in Earth's atmosphere.

How long does it take for the Earth to complete one full rotation on its axis?

• One year

• One month

• 24 hours

• 12 hours

When one side of the Earth is experiencing daytime, what is happening on the opposite side?

• It is also daytime.

• It is nighttime.

• It is dawn.

• It is twilight.

How long does it take for the Earth to complete one full revolution around the Sun?

• 24 hours

• 365 days

• One month

• 7 days

What force keeps the Earth in its orbit around the Sun?

• Magnetic force

• Air pressure

• Gravity

• Centrifugal force