Classes of Rock

Which of the following describes rocks formed by the compaction of living things?

• Clastic
• Organic
• Foliated 
• Nonfoliated

Which of the following describes rocks formed by sand, clay, and smaller pebbles?

• Clastic
• Organic
• Foliated
• Nonfoliated

Which class of rock forms when rocks are transformed by intense heat and pressure?

• Sedimentary 
• Metamorphic
• Igneous
• Pop rocks

Which rock is formed form the cooling of volcanic ash?

• Obsidian
• Granite
• Pumice
• Basalt

How is the rock Coal classified?

• Igneous intrusive
• Igneous extrusive
• Sedimentary clastic
• Sedimentary organic

Which class of rocks are formed by the cooling of molten rock or ash?

• Sedimentary
• Metamorphic
• Igneous
• Pop rocks

How is the rock Granite classified?

• Igneous intrusive
• Igneous extrusive
• Metamorphic foliated
• Metamorphic nonfoliated

How would you classify the rock in the picture?

• Organic
• Clastic
• Intrusive
• Extrusive

How would you classify the rock in the picture?

• Intrusive
• Extrusive
• Clastic
• Organic

Which class of rocks is formed by the deposition and compaction of materials in a body of water?

• Sedimentary

• Metamorphic

• Igneous

• Pop rocks