Earth's Formation and Structure Quiz

What process caused the Earth to differentiate into layers?

• Photosynthesis

• Chemical differentiation

• Gravitational pull

• Magnetic field generation

Which gases were primarily present in Earth's early atmosphere?

• Hydrogen and helium

• Oxygen and nitrogen

• Argon and neon

• Nitrogen, methane, ammonia, and carbon dioxide

What is the primary composition of Earth's inner core?

• Silicate rock

• Carbon dioxide

• Iron-nickel alloy

• Liquid magma

How is Earth's magnetic field generated?

• By the motion of liquid iron in the outer core

• Through the movement of tectonic plates

• Through solar winds

• By the rotation of the Earth

What is the main difference between oceanic and continental crust?

• Oceanic crust is denser and thinner

• Continental crust is thinner and denser

• Oceanic crust is thicker and less dense

• Continental crust is denser and thicker

What is the primary component of the Earth's mantle?

• Silicate minerals rich in iron and magnesium

• Iron-nickel alloy

• Carbon dioxide

• Liquid iron

What process introduced oxygen into Earth's atmosphere?

• Volcanic eruptions

• Photosynthesis

• Meteor impacts

• Chemical differentiation

What is the current primary composition of Earth's atmosphere?

• 78% oxygen, 21% nitrogen

• 50% nitrogen, 50% oxygen

• 78% nitrogen, 21% oxygen

• 50% carbon dioxide, 50% nitrogen

What element in the atmosphere is a result of potassium decay?

• Nitrogen

• Argon

• Oxygen

• Helium

What was the likely concentration of CO2 in Earth's early atmosphere?

• 21% oxygen

• 78% nitrogen

• 400 parts per million

• 2% level concentrations