Types of Rocks on Earth

What is the Earth's crust made of?

• Water

• Gases

• Rocks

• Ice

What are igneous rocks formed from?

• Sedimentary material

• Molten (liquid) rock that has cooled and solidified

• Organic matter

• Meteorite impacts

What is the molten rock underground called?

• Lava

• Basalt

• Magma

• Granite

What do we call molten rock when it reaches the surface?

• Magma

• Basalt

• Granite

• Lava

What determines the size of the crystals in igneous rocks?

• The depth at which the rock is buried

• The speed at which the molten magma solidifies

• The amount of organic matter mixed with the rock

• The impact of meteorites

What type of igneous rock is Obsidian?

• Intrusive igneous rock

• Metamorphic rock

• Sedimentary rock

• Extrusive igneous rock

What type of igneous rocks are formed by magma that has cooled slowly, deep underground?

• Metamorphic rocks

• Sedimentary rocks

• Intrusive igneous rocks

• Extrusive igneous rocks

Granite is an example of which type of igneous rock?

• Extrusive igneous rock

• Metamorphic rock

• Sedimentary rock

• Intrusive igneous rock

What is the texture of obsidian?

• Rough and dull

• Smooth and shiny

• Sticky and elastic

• Soft and crumbly

Which of the following are examples of sedimentary rocks?

• Granite, basalt, and obsidian

• Chalk, limestone, and shale

• Marble, quartzite, and slate

• Pumice, scoria, and tuff