http://upload.wikimedia.org/wikipedia/commons/4/49/Olivine_basalt2.jpg

Plate Tectonics

The picture here shows the seven main plates that are moving slowly. On the edges of these plates are where the earthquakes and volcanoes are happening. Scientists have found the same fossils that where on two different continents. And so that’s some what proof that the earth was once one big piece of land.

Structure of the earth,

The crust of the earth is made up of rocks and soil, all the rocks have formed a shell like cover that protects everything.

The mantle is made up of molten rock. It can be very hot.

The outer core is made of hot iron nickel.

The inner core is solid iron. The inner core is believed to be 1200 kilometres thick.

Cross-section through a stratovolcano:

1. Large magma chamber2. Bedrock3. Conduit (pipe)4. Base5. Sill6. Branch pipe7. Layers of ash emitted by the volcano8. Flank

9. Layers of lava emitted by the volcano10. Throat11. Parasitic cone12. Lava flow13. Vent14. Crater15. Ash cloud

This is a labelled diagram of a volcano.

It shows the inside of a volcano.

Igneous Rocks are rocks that have cooled underneath the earths surface.Igneous Rocks are biggest as they have more time to cool. Basalt is an extrusive igneous rock.

Igneous rocks.

Examples of igneous rocks:Gneiss Granite Sand

Alexandrite

PlatinumAmethyst

Pyrite

Copper Ruby

Diamond

TitaniumGraphite

Examples of minerals found in igneous rocks:

Sedimentary rocks are one of the three main rocks.They are made up of layers upon layers upon layers, eventually the rocks on the bottom layer form into rock.

Metamorphic rocks are the rocks that can change form. These rocks were once sedimentary or igneous rocks. The rocks are under tons and tons of pressure, which fosters heat build up, and this causes them to change.

References• http://www.extremescience.com/

PlateTectonicsmap.htm#Spreadingboundary (plate tectonics map) 30.7.08

• http://scign.jpl.nasa.gov/learn/plate1.htm (Structure of the earth) 30.7.08

• http://en.wikipedia.org/wiki/Volcano

• http://www.fi.edu/fellows/payton/rocks/create/metamorph.htm

•http://images.ask.com/fr?q=rock+cycles&desturi=http%3A%2F%2Fwww.uwgb.edu%2Fdutchs%2FEarthSC202Notes%2FROCKCYCL.HTM&fm=i&ac=12&ftURI=http%3A%2F%2Fimages.ask.com%2Ffr%3Fq%3Drock%2Bcycles%26desturi%3Dhttp%253A%252F%252Fwww.uwgb.edu%252Fdutchs%252FEarthSC202Notes%252FROCKCYCL.HTM%26imagesrc%3Dhttp%253A%252F%252Fwww.uwgb.edu%252Fdutchs%252FGRAPHIC0%252FROCKMIN%252FRockCycle7.gif%26thumbsrc%3Dhttp%253A%252F%252F66.235.120.64%252Fts%253Ft%253D11254769070437351161%2526pid%253D23296%2526ppid%253D5%26o%3D0%26l%3Ddir%26thumbuselocalisedstatic%3Dfalse%26fn%3DRockCycle7.gif%26imagewidth%3D450%26imageheight%3D400%26fs%3D7%26ft%3Dgif%26f%3D2%26fm%3Di%26ftbURI%3Dhttp%253A%252F%252Fimages.ask.com%252Fpictures%253Fq%253Drock%252Bcycles%2526page%253D1%2526o%253D0%2526l%253Ddir%2526pstart%253D0&qt=0•http://images.ask.com/fr?q=Igneous+Rocks&desturi=http%3A%2F%2Flibrary.thinkquest.org%2F05aug%2F00461%2Figneousprint.htm&fm=i&ac=6&ftURI=http%3A%2F%2Fimages.ask.com%2Ffr%3Fq%3DIgneous%2BRocks%26desturi%3Dhttp%253A%252F%252Flibrary.thinkquest.org%252F05aug%252F00461%252Figneousprint.htm%26imagesrc%3Dhttp%253A%252F%252Flibrary.thinkquest.org%252F05aug%252F00461%252Fimages%252Figneous.jpg%26thumbsrc%3Dhttp%253A%252F%252F66.235.120.64%252Fts%253Ft%253D8514686888871535808%2526pid%253D23168%2526ppid%253D9%26o%3D0%26l%3Ddir%26thumbuselocalisedstatic%3Dfalse%26fn%3Digneous.jpg%26imagewidth%3D640%26imageheight%3D423%26fs%3D267%26ft%3Djpg%26f%3D2%26fm%3Di%26ftbURI%3Dhttp%253A%252F%252Fimages.ask.com%252Fpictures%253Fq%253DIgneous%252BRocks%2526page%253D1%2526o%253D0%2526l%253Ddir%2526pstart%253D0&qt=0 (igneous rocks and information) 1.8.08

References