Classifying Rocks into One of Three Main Categories

Igneous rock forms in regions where--

• A rock is heated to melting point then cooled to a solid.
• Metallic minerals are put under extreme pressure.
• A river deposits sand and mud over a long time.
• Evidence of organisms is becoming fossilized.

Sedimentary rocks will most likely form an environment where--

• Two land masses are colliding.
• Liquid rock is hardening into a solid.
• Minerals are being created under pressure.
• Particles of rocks are accumulating.

Which of the following produce metamorphic rocks?

• Rapid burial
• Gradual cooling
• Regular deposition
• Extreme pressure

Scientists classify igneous, metamorphic, and sedimentary rocks based on their--

• shape
• color
• formation
• usefulness

Which of the following best describes the processes that form igneous rocks?

• Deposition and cementation
• Heating and extreme pressure
• Crystallization and solidification
• Erosion and compaction

Rocks formed deep underground while under extreme temperature and pressure

• Sedimentary rock
• Metamorphic rock
• Igneous rock

Rocks formed when super-heated magma or lava cools and hardens

• Sedimentary rock
• Metamorphic rock
• Igneous rock

Rocks formed by the process of deposition, compaction, and cementation

• Sedimentary rock
• Metamorphic rock
• Igneous rock

______________ rocks contain a variety of different rock particles that are cemented together.

• Sedimentary
• Metamorphic
• Igneous

______________ rocks are formed when rocks are changed by heat and pressure.

• Sedimentary
• Metamorphic
• Igneous