Angstrom Care 培苗社 Rocks II

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Angstrom Care 培苗社 Rocks II 積極推崇『我要學』的心態， 糾正『要我學』的被動心態。 www.AngstromCare.com

Rocks There are 3 types of rocks. Igneous, metamorphic and sedimentary. Some rocks have air bubbles because of the way they are formed. Rocks such as Millstone Grit have these properties and are otherwise known as Sedimentary Rocks Other rocks don’t have air bubbles, these tend to have crystals Crystals have a more jagged form (meaning they fit together more easily) This means there’s less air bubbles therefore its a denser rock Metamorphic and Igneous rocks have these properties. www.AngstromCare.com

Metamorphic Metamorphism means "changed form". The Changes occur because of: Heat Pressure www.AngstromCare.com

How metamorphic rocks change Say a sedimentary rock is pushed down towards the earth’s mantle The magma heats it up and changes its structure Also the pressure can take part in this process. The pressure comes from rocks above and they get pushed down. So the texture, mineral structure and physical properties all change However, they have the same because they have the same chemical compounds. www.AngstromCare.com

Sedimentary Rocks For thousands, even millions of years, little pieces of our earth have been eroded broken down and worn away by wind and water 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 www.AngstromCare.com

A new sedimentary rock has formed ! Continued ... These layers are pressed down more and more through time, until the bottom layers slowly turn into rock. The weight of all the layers squeezes out most of the water from the sediment Chemicals in the water cement the bits of sand and mud together A new sedimentary rock has formed ! www.AngstromCare.com

Igneous Rocks Igneous rocks are formed ... When molten rock (magma) is pushed up from beneath the earth’s crust It cools to form solid rock Properties They contain crystals and they are hard There are two types of igneous rock Intrusive and extrusive www.AngstromCare.com

Continued... Intrusive igneous rocks have cooled slowly in the earth’s crust They have large crystals Extrusive igneous rocks cool quickly They have small crystals www.AngstromCare.com

Thank you www.AngstromCare.com

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