SCIENCE (Review Activity No. 1.4)- COMETS

What is a comet primarily made of?

• Metal and lava
• Dust, rock, gas, and ice
• Water and fire
• Soil and sand

Which part of the comet is the frozen center of its head?

• Coma
• Nucleus
• Ion tail
• Dust tail

What surrounds the nucleus of a comet?

• Coma
• Ion tail
• Dust tail
• Hydrogen envelope

What causes the ion tail to form?

• The gravity of the Earth
• The comet's rotation
• Solar wind
• The impact of meteoroids

How does the ion tail behave when a comet is approaching the Sun?

• It curves around the nucleus
• It trails the comet
• It leads the comet
• It becomes invisible

What causes the dust tail to develop?

• The comet's distance from Earth
• The comet's proximity to the Sun
• The impact of other celestial bodies
• The comet's speed

How long can the dust tail of a comet be?

• 1 million km
• 10 million km
• 50 million km
• 250 million km

What is the hydrogen envelope?

• A visible layer of water vapor
• The core of the comet
• An invisible layer of hydrogen around the coma
• The outer layer of the nucleus

Why can't the hydrogen envelope be seen from Earth?

• It is too small
• Its light is absorbed by Earth's atmosphere
• It does not emit light
• It is covered by the dust tail

Which part of a comet contains most of its mass?

• Coma
• Nucleus
• Dust tail
• Ion tail