Rocks

By Simone Cairns

9mt

What are rocks used for??

• We need rocks for everything when couldn’t live if we didn’t have rocks we need rocks for

• building • Make food and plants • Weapons • Headstone • Roads

Rocks are important to us but we just don’t see it

The types of rocks

• 1. igneous which is from a volcanoes

• 2. sedimentary which is from period of time under water

• 3.metamorphic rock which was once a other rock but got change by the sun

Igneous rocks

• Fire Rocks

• Formed underground by trapped, cooled magma

• Formed above ground when volcanoes erupt and magma cools

• E.G granite, scoria and basalt Fire RocksIgneous Rocks

Sedimentary rock

• The wind and water breakdown the earth its settle in a lake and river layer will form , the pressure and time will turn into a rock e.g. sand rock limestone and gypsum

Sedimentary Rocks

Metamorphic rock

• Rocks that have been change by the sun it used to be sedimentary pressure and heat has change them or igneous rock e.g. gold diamonds crystal

Metamorphic Rocks

Erosion is

• Erosion is when the weathering breakdown the rock it is due by the heat water ice is rubbing against the rock

• weathering • Weathering is the breakdown of

rocks due to the weather

Freeze-thaw weathering

• When water get into a crack in a rock

• As the water turns in to ice it expands

• Cause the little crack to open a little

• As it repeated freezing and thawing weaken the rock

• Common in mountains where the temperature are often around freezing point

Picture of what happen

Onion skin

• This start when a rock is repeated heated and cooled

• As the rock gets heated in the day the outer layer of the rock expands slightly

• This mostly happen it the desert

• Then the skin starts to peel of this is erosion

Biological weathering

• Seed falls into crack of rocks

• Where it will find shelter

• As the seed starts to grow the rock has to starts to break so then the rock get broking up

•

Acid rain

• Acid is in our rain it attack the rock and the will soon melt them it does not look the same

Message from Mr Manson

• Some nice, useful work on this story Simone • I think I would have liked to see you use the

pictures a bit better, especially at the start to help you illustrate the points that you are making

• But some very good work and presentation – don’t go overboard on the custom animations!

• A2