Read about it: The Rock Cycle

How do geologists classify rocks?

• By color

• By size

• By how they form in the rock cycle

• By weight

What are sedimentary rocks made of?

• Solid minerals

• Particles from other rocks

• Liquid minerals

• Gases

What carries rock fragments away in the process of erosion?

• Fire

• Water, wind, or ice

• Earthquakes

• Sunlight

What is the main characteristic of sedimentary rocks?

• They are very hard

• They are often layered

• They are always smooth

• They are metallic

What is an example of a foliated metamorphic rock?

• Granite

• Pumice

• Slate

• Basalt

What is the main component of metamorphic rock formation?

• Water

• Air

• Heat

• Light

What is the main feature of extrusive igneous rock?

• Large crystals

• Small crystals or no crystals

• Bands of minerals

• Random mineral arrangement

What is the role of heat and pressure in the rock cycle?

• To create sedimentary rock

• To transform rocks into metamorphic rock

• To melt rocks into magma

• To cool rocks into igneous rock

What does the rock cycle illustrate about Earth's materials?

• They are constantly recycled

• They are never changed

• They are always new

• They are destroyed

What did Native Americans often use obsidian for?

• Making tools such as drills and arrowheads

• Building houses

• Creating pottery

• Weaving baskets