1. What happens to mantle rock as it is heated by Earth's core?
- A. It becomes denser and sinks.
- B. It becomes less dense and rises.
- C. It solidifies and stops moving.
- D. It instantly melts into liquid magma.
2. Which statement best describes the overall process of a mantle convection current?
- A. Rock is heated by the core, rises, cools near the surface, and then sinks.
- B. Rock is cooled by the crust, sinks, is melted by the core, and erupts from volcanoes.
- C. Tectonic plates collide, forcing rock down into the mantle where it melts.
- D. The core's rotation spins the mantle, creating a whirlpool effect that moves the plates.
3. What is the original source of energy that powers mantle convection?
- A. Solar radiation from the sun
- B. Gravitational pull from the moon
- C. Heat from the Earth's core
- D. Chemical reactions in the crust
4. What is the primary role of convection currents within Earth's mantle?
- A. To transfer heat from the crust to the core
- B. To generate the planet's magnetic field
- C. To provide the main force that drives the movement of tectonic plates
- D. To break down old rock and create new magma at the surface
5. The rising and sinking of rock that creates convection currents is a direct result of changes in which property?
- A. Weight
- B. Density
- C. Volume
- D. Mass
6. The text compares the mantle's consistency to hard wax or silly putty. This analogy is used to illustrate that the mantle is a solid that can...
- A. melt into a liquid instantly.
- B. stretch and change shape over time.
- C. shatter into many small pieces.
- D. conduct electricity very efficiently.
7. The ability of the mantle to flow very slowly over geologic time is a crucial factor that directly enables which major Earth process?
- A. The daily cycle of tides in the oceans
- B. The formation of clouds in the atmosphere
- C. The movement of tectonic plates
- D. The creation of Earth's magnetic field
8. Imagine a substance that is solid at room temperature. If you leave a heavy weight on it for a year and notice the substance has slowly flattened without breaking, its behavior is most analogous to which Earth layer?
- A. The mantle
- B. The ocean
- C. The atmosphere
- D. The brittle outer crust
9. Which statement best describes the physical state of Earth's mantle?
- A. A liquid layer of molten rock like lava
- B. A rigid, brittle solid that fractures easily under stress
- C. A solid material that can slowly deform and flow over long periods due to heat and pressure
- D. A gaseous layer trapped between the crust and the core
10. What conditions within Earth are primarily responsible for the mantle's ability to flow?
- A. The constant rotation of the Earth on its axis
- B. The immense heat and pressure from surrounding layers
- C. The magnetic field generated by the Earth's core
- D. The cooling effect from the overlying crust