“The structure of the Earth” Post Test

Which of the following statements about Earth's age is most accurate?

• Earth is estimated to be 5.54 billion years old.

• Earth is estimated to be 3.54 billion years old.

• Earth is estimated to be 4.54 billion years old, plus or minus about 50 million years.

• none of the above

Which method is commonly used in geology to determine the age of rocks and minerals?

• Carbon-14 dating

• Tree-ring analysis

• Radiometric dating

• Ice core sampling

What is the primary reason Earth has a magnetic field?

• Rapid rotation

• Molten nickel-iron core

• Oceans and atmosphere

• Lunar influence

Which field of science examines the formation and evolution of Earth's crust?

• Meteorology

• Astronomy

• Geology

• Chemistry

According to the research published in Nature, what phenomenon regarding Earth's inner core began around 2008?

• Acceleration relative to the planet's surface

• Expansion due to volcanic activity

• Slowdown relative to the planet's surface

• Cooling caused by atmospheric changes

What are the implications of the research findings for Earth's geomagnetic field?

• No significant implications observed

• Potential reversal of the magnetic poles

• Stability in the magnetic field intensity

• Changes in the magnetic field due to inner core dynamics

How did Eratosthenes measure the circumference of the Earth?

• By observing the positions of stars and planets

• calculated the Earth's circumference by measuring the angle of the Sun's rays at two different locations

• Measuring the time it took for lunar eclipses

• Calculating the distance between different cities

What is the approximate circumference of the Earth

• 10,000 kilometers

• 20,000 kilometers

• 30,000 kilometers

• 40,000 kilometers

What is the thinnest layer of the Earth, ranging from only 2 miles in some areas of the ocean floor to 75 miles deep under mountains?

• Crust

• Mantle

• Outer core

• Inner core

Which part of the Earth forms the continents, consists of sial (silicon-aluminum) rock, is 10-50 km thick, and is older than the oceanic crust?

• Mantle

• Oceanic crust

• Outer core

• Continental crust