Layers of the earth!

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The earth has four different layers: the crust, mantle, inner core, and outer core. The lithosphere is the crust and the upper part of the mantle which are the two outter layers. The lithosphere is about 5 to 30 miles deep from the curst to the center. The mantle is about 1800 miles thick. The outer core is about 1300 miles thick and the inner core is about 800 miles to the center of the earth. The inner core is a solid layer. Earthquakes start at the lithosphere. The crust is a thin rocky skin. The ocean floor is heavy, dense rock and the land is lighter, less dense rock. The upper part of the mantle is cooler than the deep mantle.

Rock Jokes :)

What did the sedimentary rock tell his teacher during the test to become a metamorphic rock?

-This is too much pressure!-

What did one rock say to the other rock?


-Nothing it's a rock!!!-

Where is grandma rock's favorite place to sit?

-Her ROCKing chair!-

How do rocks wash their clothes?

-In the rock cycle!!-

The rock cycle!

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Rocks are the most common matirial on this earth. They are made of one or more minerals.

This diagram explains how the 3 types of rock, igneious, sedimentary and metamorphic are all related.
Plate tectonic movement is the main reason for the recycling of rock materials and is the main force of the rock cycle.


Rock Cycle In MS Paint - The most popular videos are a click away

Irelands rocks types

Irelands main rock type is Limestone, it fills the centre of Ireland from East to West and it goes north and south for a huge distance.

Sedimentary Rocks

Over a huge number of years, little pieces of the earth have been eroded and worn away by weathering. These little bits of our earth are washed downstream where they settle to the bottom of the rivers, lakes, and oceans. Layer after layer of eroded earth is deposited on top of each. These layers are pressed down more and more through time, until the bottom layers slowly turn into rock.
In these rocks you can see the layers which are called strata. And these rocks normaly contain alot of fossils of animals, plants

Sandstone, Limestone, Shale, Conglomerate and Gypsum are all example of Sedimentary rocks.

Here is a video with a good song to explain more :)


http://video.google.com/videosearch?q=sedimentary+rocks&www_google_domain=www.google.com&emb=0&aq=0&oq=sedimentar

Metamorphic Rocks are created from either igneious or sedimentary rocks.

Metamorphic rocks are formed when ignious rock or sedimentary rock is under tonnes of pressure and heat which changes the rock to metamorphic rock.

Schist, Gneiss are both examples of metamorphic rock.


Schist is created from Basalt (igneious rock), Shale (sedimentary rock) or slate (a metamorphic rock)

Gneiss is created from granite which is an igneous rock.

Fire Rocks

Igneous rock is formed by cooling magma or lava and it is formed above ground and is formed below the earths surface. Igneous rocks are also known as "Fire Rocks" Because they are formed from molten rock. Granite, scoria, pumice and obsidian are all examples of Igneous rock. Granite is formed above ground when lava is exposed and cools rapidly which forms large crystals in the rock. These rocks are usually light in colour. Scoria, pumice and obsidian are formed when magma is trapped and cools slowly which forms little crystals and these rocks are usually stronger and darker in colour than the rocks formed above ground.