1. What is the primary source of the material that forms magma deep within the Earth?
- A. New matter created in the Earth's core
- B. Pre-existing rocks that are melted
- C. Water from the oceans that is superheated
- D. Metallic elements from the planet's core
2. The transformation of existing solid rock into liquid magma is primarily a change in the rock's...
- A. physical state.
- B. elemental composition.
- C. total mass.
- D. magnetic properties.
3. Which of the following statements most accurately describes the origin of magma?
- A. Magma is exclusively formed from the melting of other igneous rocks.
- B. Magma is new material that flows up from the Earth's solid inner core.
- C. Magma can be formed from the melting of any type of existing rock.
- D. Magma is created when seawater mixes with hot minerals on the ocean floor.
4. The formation of magma from solid rock is an example of what fundamental principle?
- A. The creation of new matter through volcanic activity
- B. The process of chemical weathering on the Earth's surface
- C. The constant recycling of materials within the Earth system
- D. The radioactive decay of elements in the Earth's crust
5. What primary condition is necessary to transform a solid piece of surface rock, like sandstone, into liquid magma?
- A. Exposure to air and water for erosion
- B. Rapid cooling in a sub-zero environment
- C. Being forced deep underground to encounter intense heat
- D. Being compressed by the weight of ocean water
6. Which statement accurately describes the physical transformation that occurs when magma is created?
- A. Solid rock absorbs internal heat until its temperature rises enough for it to liquefy.
- B. Intense pressure forces solid rock to compact into a liquid without a change in temperature.
- C. Water mixes with hot rock, causing it to dissolve into a liquid state.
- D. Solid rock cools rapidly, causing it to fracture and become a liquid.
7. A geologist discovers a large body of molten rock deep within Earth's crust. What is the correct scientific term for this material?
- A. Lava
- B. Sediment
- C. Magma
- D. Metamorphic rock
8. If a large section of solid rock in the lower crust begins to absorb a significant amount of heat from the mantle, what is the most likely outcome?
- A. The rock will become harder and more dense.
- B. The rock will undergo weathering and break into smaller pieces.
- C. The rock will melt and form a body of magma.
- D. The rock will be pushed to the surface by convection currents.
9. For magma to be created, what must happen to solid rock?
- A. It must be exposed to air and water.
- B. It must absorb a massive amount of heat.
- C. It must be rapidly cooled to below freezing.
- D. It must be broken down into small sediments.
10. What is the primary energy source responsible for the transformation of solid rock into liquid magma?
- A. Solar radiation absorbed by Earth's crust
- B. Frictional heat from the movement of tectonic plates
- C. Chemical reactions occurring in sedimentary rock layers
- D. Thermal energy originating from Earth's core and radioactive decay