The Secret Life of Rocks Thier Life will Rock you

Sedimentary Rocks

Sedimentary rocks that has formed through the deposition and solidification of sediment, especially sediment transported by water ,ice, and wind. Sedimentary rocks are often deposited in layers, and frequently contain fossils.Limestone and shale are common sedimentary rocks that contains fossils.

Where sedimentary rocks come from


Limestone- made from shells that were buried
limestone is normally found in the ocean


Sandstone-is made from compacted pieces of sand
sedimentary rocks are found in the ocean


Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate. Gypsum is a common mineral.
Sedimentary Rocks are found in large bodies of water

Igneous Rocks

Igneous rock ( Latin word ignis meaning fire), is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rock is formed through the cooling and solidification of magma or lava.

Rock Cycle


Diorite is an intrusive igneous rock composed principally of the silicate minerals plagioclase feldspar biotite, hornblende, and/or pyroxene. The chemical composition of diorite is intermediate, between that of mafic gabbro and felsic granite.
Intrusive Rocks are crystalline magma


Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools rapidly with minimal crystal growth.
Extrusive rocks are formed from lava that cools quickly

Metamorphic Rocks

A metamorphic rock is a result of a transformation of a pre-existing rock. The original rock is subjected to very high heat and pressure, which cause obvious physical and/or chemical changes.

Rock Cyle


Gneiss is a high grade metamorphic rock, meaning that it has been subjected to higher temperatures and pressures than schist.
Metamorphic rocks are found in the crust of the earth


Marble is a metamorphic rock composed of recrystallized carbonate minerals, most commonly calcite or dolomite.
Metamorphic rocks are found in the crust of the earth



The Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer material.

These materials are used to test hardness:


Has a hardness of 2.5

cooper penny

Hardness of 3.5

a knife blade

Has a Hardness of 5.5

window glass

Has a hardness of 6..5

steel file

Has a hardness of 6.5

Streak test

The color of the powder is the color of the streak. Instead of actually crushing a mineral to determine the streak, They swipe the mineral across a streak plate. A streak plate is an unglazed piece of porcelain, such as the underside of a ceramic tile.

Porcelain Plate used in the streak test


Created with images by FolioRoad - "rocks"

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