Year 8 MSHS Rock properties and Igneous rocks

Which of the following is NOT one of the three main types of rocks?

• Igneous
• Sedimentary
• Metamorphic
• Crystalline

Igneous rocks are formed from:

• The accumulation of sediment
• The cooling and solidification of magma or lava
• The transformation of existing rocks under heat and pressure
• The evaporation of water

Sedimentary rocks are primarily formed by:

• The cooling of molten rock
• The compaction and cementation of sediments
• The melting of existing rocks
• The transformation of rocks under high pressure

Metamorphic rocks are created by:

• The accumulation of biological material
• The cooling of magma
• The alteration of existing rocks by heat and pressure
• The deposition of minerals from a solution

What property is measured on the Mohs scale?

• Luster
• Hardness
• Density
• Streak

What does a large crystal size in an igneous rock indicate about its cooling history?

• It cooled quickly
• It cooled slowly
• It formed under high pressure
• It formed under low pressure

Intrusive igneous rocks typically have:

• Small crystals
• Large crystals
• No crystals
• Mixed crystal sizes

Extrusive igneous rocks are characterized by:

• Large crystals
• Coarse-grained texture
• Small crystals
• Slow cooling

Which of the following is a common intrusive igneous rock?

• Basalt
• Pumice
• Granite
• Obsidian

Which of the following is a common extrusive igneous rock?

• Granite
• Diorite
• Gabbro
• Basalt