1. What is the primary source of energy or process that leads to the formation of igneous rock?
- A. The pressure from overlying layers of material compacting together.
- B. The intense heat from within the Earth that melts rock into magma.
- C. The chemical reactions caused by water dissolving minerals over time.
- D. The slow erosion of mountains by wind and rain carrying particles.
2. A large volcano erupts, and lava (molten rock on the surface) flows down its side. After several years, this material cools and solidifies. What type of rock has been formed?
- A. Sedimentary rock
- B. Igneous rock
- C. Compacted rock
- D. Layered rock
3. Which of the following best describes the material that is the starting point for most sedimentary rock?
- A. Hot, liquid magma from deep within the Earth's crust.
- B. Layers of accumulated sand, mud, and small pebbles.
- C. A single, large crystal that grows over millions of years.
- D. Molten metal that has cooled and hardened on the surface.
4. What is the scientific term for the molten rock found beneath the Earth's surface that forms igneous rock upon cooling?
- A. Sediment
- B. Magma
- C. Debris
- D. Pebble
5. The formation of sedimentary rock involves the buildup of debris. Which of these is the key process for forming igneous rock instead?
- A. Accumulation of sand
- B. Erosion by water
- C. Cooling of magma
- D. Hardening of mud layers
6. A geologist finds a rock that appears grainy and is composed of many small, visible particles cemented together. What process most likely formed this rock?
- A. The rapid cooling of lava on the Earth's surface.
- B. The accumulation and bonding of sand and silt over time.
- C. The slow crystallization of magma deep underground.
- D. The intense heat and pressure from tectonic plate movement.
7. A student on a field trip discovers a rock that is clearly made of sand and small pebbles cemented together. Based on this texture, the rock is best classified as:
- A. Igneous
- B. Sedimentary
- C. Volcanic Glass
- D. Metamorphic
8. The formation process involving the cooling and freezing of molten liquid results in which type of rock?
- A. Igneous
- B. Sedimentary
- C. Fragmented
- D. Metamorphic
9. While hiking near an ancient volcano, you find a dark-colored rock. Which texture would indicate it is an igneous rock formed from lava?
- A. Tightly interlocking crystals
- B. Distinct layers of ash and sand
- C. A grainy feel like sandpaper
- D. Imprints of leaves or shells
10. The presence of distinct layers in a rock sample is strong evidence that the rock was formed by...
- A. the rapid freezing of molten material on a slope.
- B. the growth of large, interlocking crystals deep underground.
- C. the transformation of another rock by extreme heat.
- D. the deposition and cementing of particles over time.