Classification of Rocks

Types of Rocks

There are 3 Types of Rocks!

• Metamorphic

• Igneous

• Sedimentary

What are Rocks classified by??

• The processes they are formed by!

• 
  

What are they made of?

• Rocks are made up of MINERALS

• Minerals are made of ELEMENTS

• Ex: Quartz & Calcite

Simple to Complex

Elements to Minerals to Rocks

The Rock Cycle

The rock cycle allows for rocks to change from one type of rock to another over time. For example, an igneous rock can turn into a metamorphic rock by going through certain processes and then change again to be an igneous rock.

Multiple Choice

Which of the following is NOT one of the 3 types of rocks?

• Sedimentary

• Minerals

• Igneous

• Metamorphic

Multiple Choice

How are rocks classified?

• Based on how they are formed

• What color they are

• What they are shaped like

• Where they are found

Igeneous Rocks

How are they formed?

Form from magma cooling and hardening.

• Characteristics:

shiny/ look like glass

porous (tiny holes)

• Examples:

Obsidian, granite, basalt, and etc

Metamorphic Rocks

How are they formed?

Formed from extreme heat and pressure.

• Where are they found?

• Characteristics:

Wavy layers,

may have crystals

• Examples:

Gneiss, marble, slate, and etc

Sedimentary Rocks

How are they formed?

Formed when sediments (tiny particles of

sand, shells, pebbles, etc. are cemented and compacted together.

• Characteristics:

Chunks May have fossils My break easily

• Examples: conglomerate, limestone, sandstone, shale, and etc

Multiple Choice

If I have a rock with wavy layers, what type of rock is it most likely to be?

• metamorphic

• igneous

• sedimentary

Multiple Choice

Which type of rock forms from cooling and hardening?

• Sedimentary

• Metamorphic

• Igneous

Multiple Choice

What type of rock forms from heat and pressure?

• igneous

• metamorphic

• sedimentary

Weathering

When sediments go through the process of wearing or being worn down by long exposure to the atmosphere.

Erosion

When sediments of the rocks are eroded by wind, water, or other natural agents.

Deposition

When the sediments stop moving and are deposited in a new location.

Compacting

The layers are pressed together and packed down and more sediment may be added.

Cementation

Water may be involved to compact sediment together to form rock. Form sedimentary rocks.

Multiple Choice

When sediments stop moving and are deposited in a new location

• erosion

• weathering

• deposition

Multiple Choice

What happens when cementation occurs in the rock cycle?

• Sedimentary rocks form

• Metamorphic rocks form

• Igneous rocks form