Rocks and Minerals

By Sean Stanton

Types of Rocks

There are 3 types of rocks Igneous Sedimentary Metamorphic

Igneous Rocks

Igneous rocks are formed by hot molten material that cool’s and hardens.

The word igneous means fire made. This m molten material may cool

above or under the earths surface.

obsidian

Sedimentary Rocks

Sedimentary rocks are formed by layers that tell age over time.

an example of a sedimentary rock is sandstone.

To see a volcano in action click here.

Metamorphic rocks

The word metamorphic means changed in form.

Metamorphic rocks are formed by heat and/or pressure.

An example of a metamorphic rock is marble.

Marble is made from limestone heated and pressurized.

The Rock cycle

The rock cycle is a never ending process where rocks are changed.

Without the rock cycle there would not be any rocks.

Minerals

Minerals are what rocks are made of. You can tell a mineral by

luster,color,hardness and streak plate

An example of a mineral is quartz

Vocabulary

Minerals-a naturally occurring substance ,neither a plant nor animal.

Igneous rocks –fire made rock formed from melted rock material .

Sedimentary rocks-rocks formed from bits or layers of rocks segmented together.

Relative age-the age of something compared to the age of another thing.

Rock cycle-a never ending process in witch rocks are changed.

Metamorphic rock- a rock formed by heat and/or pressure.

CREDITS

SCIENCE TEXT BOOK COPYWRITE DATE 2006

To see the coolest teacher’s website click here.