Everything You Need to Know about the Earth

What was the primary material that led to the formation of Earth 4.6 billion years ago?

• Fragments of asteroids

• Gas from living stars

• Remnants of dead stars

• Dust from comets

Which process is responsible for the movement of Earth's crust and the formation of mountains?

• Earthquakes

• Plate tectonics

• Ocean currents

• Volcanic eruptions

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

• Magnesium and sulfur

• Iron and nickel

• Silicate rocks

• Carbon and oxygen

Which layer of the atmosphere contains the ozone layer that protects us from harmful UV radiation?

• Exosphere

• Stratosphere

• Mesosphere

• Troposphere

At what altitude does space officially begin according to human definitions?

• 100 km

• 150 km

• 80 km

• 50 km