Entry Exam Category: Graduate & Professional Program Admission Exams
Course: Praxis
Exam: Praxis Elementary Science 5005 Practice Test
Practice Question
Earth's diameter is approximately 12,700 kilometers. Which of the following layers is located approximately 6,000 kilometers beneath Earth's surface and is composed primarily of iron and nickel?
Answer Choices
- A: The core
- B: The crust
- C: The lithosphere
- D: The mantle
Correct Answer: A
Rationale: Core at ~6,000km depth, Fe-Ni. B: Crust thin outermost. C: Lithosphere crust+upper mantle. D: Mantle silicates. Composition and depth identify core.