Life on Planet Earth

The habitable zone in the solar system is defined as

• It is the region around the Sun where conditions are right for liquid water to exist on a planet's surface.

• It is the region within the asteroid belt.

• It is the zone devoid of any solar radiation.

• It is the area inside the orbit of Mercury.

The Sun is a _______ star that emits roughly the same amount of energy each day.

• G-type main-sequence

• Red dwarf

• Blue giant

• White dwarf

Which gases are responsible for holding in and regulating thermal energy in Earth's atmosphere?

• Greenhouse gases

• Noble gases

• Halogen gases

• Oxygen and Nitrogen

Earth is massive enough to have enough _______ to keep its atmosphere particles.

• gravity

• magnetism

• pressure

• force

Earth's magnetic field protects the Earth by deflecting charged particles.

• It shields Earth from solar wind

• It causes volcanic eruptions

• It is responsible for plate tectonics

• It regulates ocean currents

Earth contains water and _______ that are needed for life to exist.

• other chemicals

• magnetic field

• iron

• minerals

What is the medium size star at the center of our solar system?

Earth is the 3rd planet orbiting the ____.

• Earth is the 3rd planet orbiting the Sun.

• Earth is the 3rd planet orbiting the Mars.

• Earth is the 3rd planet orbiting the Moon.

• Earth is the 3rd planet orbiting the Jupiter.

The Milky Way has approximately 100 to 400 billion stars.

• 100 to 400 million

• 100 to 400 billion

• 1 trillion

• Unknown

What is the name of our galaxy?