Earth Science Quiz

How thick is the Earth's crust according to the text?

• 88 centimeters

• 3030 kilometers

• 100100 kilometers

• 2222 meters

What causes the Earth to act like a giant magnet?

• The inner core's solid metals

• The motion of the outer core

• The movement of tectonic plates

• The flowing mantle

How long have humans like us been on Earth?

• 4.5 billion years

• 3 million years

• 30,000 years

• 100,000 years

Which layer of the Earth is flowing as slowly as fingernails grow?

• The outer core

• The inner core

• The mantle

• The crust

What is the average speed at which continents move across Earth's surface?

• 88 centimeters per year

• 3030 centimeters per year

• 22 meters per year

• 1515 centimeters per year

Which type of rock forms from tiny pieces broken down by wind and water?

• Metamorphic

• Sedimentary

• Igneous

• Mineral

What important discovery did scientists make about Mars in 2004?

• That it had volcanoes

• That it had an atmosphere

• That it once had liquid water

• That it had living organisms

What are the two metals that make up most of the Earth's inner core?

• Gold and silver

• Copper and zinc

• Iron and nickel

• Aluminum and titanium

When did the Grand Canyon start to form?

• 4.5 billion years ago

• 2 million years ago

• 30,000 years ago

• 100,000 years ago

What do scientists use to learn about life long ago?

• Fossils in sedimentary rocks

• Volcanic eruptions

• Ocean vents

• Tectonic plates