The Rock CycleThe Rock Cycle

A rock is a naturally formed A rock is a naturally formed solid that is usually made up solid that is usually made up of one or more types of of one or more types of minerals.minerals.Some rocksSome rockshowever can contain however can contain no minerals such as no minerals such as Obsidian and coal. Obsidian and coal.

The Rock CycleThe Rock Cycle

Since the earth is Since the earth is a majority of rock a majority of rock there are many uses there are many uses for it such as:for it such as:

The building of The building of houses andhouses and skyscrapersskyscrapers

The Rock CycleThe Rock Cycle

The sources of metals such as The sources of metals such as aluminum, iron, and copperaluminum, iron, and copper

The Rock CycleThe Rock Cycle

The carving of statues and other works of The carving of statues and other works of artart

The Rock CycleThe Rock Cycle

A base for pavement for roads and A base for pavement for roads and highwayshighways

There are many famous monuments and There are many famous monuments and structures made from rocks structures made from rocks

The Rock CycleThe Rock Cycle

Granite blocks from the Great Wall of Granite blocks from the Great Wall of ChinaChina

The Rock CycleThe Rock Cycle

Limestone blocks make up the great Limestone blocks make up the great pyramid in Egyptpyramid in Egypt

The Rock CycleThe Rock Cycle

At Mount Rushmore granite was carved At Mount Rushmore granite was carved for the four U.S. presidentsfor the four U.S. presidents

The Rock CycleThe Rock Cycle

Rocks are always changing, by that Rocks are always changing, by that change can take thousands to millions of change can take thousands to millions of years.years.

The rock cycle is a set of natural The rock cycle is a set of natural processes that form, change, break down processes that form, change, break down and reform rocksand reform rocks

The Rock CycleThe Rock Cycle

The rock cycle never ends it goes on The rock cycle never ends it goes on continuallycontinually

There are three types of rocksThere are three types of rocks

Igneous Rock when molten rock cools and Igneous Rock when molten rock cools and becomes a solid. Igneous rock can form becomes a solid. Igneous rock can form on the surface or at depths of the earth on the surface or at depths of the earth over time. over time.

The Rock CycleThe Rock Cycle

The Rock CycleThe Rock Cycle

Sedimentary rock forms when loose rock Sedimentary rock forms when loose rock and other materials are carried by water and other materials are carried by water and wind and then layered.and wind and then layered.

Minerals can grow on this rock over time. Minerals can grow on this rock over time. Sedimentary rock can also form when Sedimentary rock can also form when water evaporates.water evaporates.

The Rock CycleThe Rock Cycle

Metamorphic rock forms when heat and Metamorphic rock forms when heat and pressure cause older rock to change into pressure cause older rock to change into new rocks. new rocks.

The heat and pressure can cause the rock The heat and pressure can cause the rock and the minerals to change over time. and the minerals to change over time.

The Rock CycleThe Rock Cycle

Most of earth’s crust is made up of Most of earth’s crust is made up of igneous and metamorphic rock. 95%igneous and metamorphic rock. 95%

Sedimentary rock that forms in thin Sedimentary rock that forms in thin layers only make up 5% of the earth’s layers only make up 5% of the earth’s crust. crust.