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Mae dogfen y Cwricwlwm Cenedlaethol ar gyfer Gwyddoniaeth (2000) yn defnyddio "y gylchred greigiau" sydd yn cyd-fynd ag ymadroddion tebyg yn Y Termiadur Ysgol, e.e. "cylchred garbon" am y "carbon cycle". Huw ----- Original Message ----- From: Saunders, Tim To: [log in to unmask] Sent: Thursday, August 26, 2010 11:18 AM Subject: Re: The rock cycle Tybed oes rhywbeth ar wefannau CBAC neu'r Amgueddfeydd? Yn iach, Tim ------------------------------------------------------------------------------ From: Discussion of Welsh language technical terminology and vocabulary [mailto:[log in to unmask]] On Behalf Of John Williams Sent: 26 August 2010 11:11 To: [log in to unmask] Subject: Re: The rock cycle Does neb o'r staff dysgu i mewn heddiw ond mae GYA yn cynnig 'cyfnod' yn y cyd-destun hwn, ac o edrych ar yr isod, o wefan BBC Bitsize KS3, dwi'n meddwl y byddai cylchred neu gyfnod yn iawn - bod cyfnod yn cyfeirio at fywyd cyfan y graig gan fod y wefan yn son amdanynt yn cael eu ffurfio a'i hailffurfio. Continual change The Earth's rocks do not stay the same forever. They are continually changing because of processes such as weathering and large earth movements. The rocks are gradually recycled over millions of years. This is called the rock cycle. For example sedimentary rocks can be changed into metamorphic rocks, and these can be weathered and the pieces transported away. These pieces could be deposited in lakes or seas and eventually form new sedimentary rock. Many routes through the rock cycle are possible. The rock cycle The processes in the rock cycle are shown in this diagram. Make sure that you understand how each type of rock forms, and be ready to give an example of each type of rock. ------------------------------------------------------------------------------ From: Discussion of Welsh language technical terminology and vocabulary [[log in to unmask]] On Behalf Of Ceri Williams (Education) [[log in to unmask]] Sent: 25 August 2010 16:15 To: [log in to unmask] Subject: FW: The rock cycle Pnawn da Rwyf wedi bod yn chwilota am y term Cymraeg am 'The rock cycle' - dwi wedi dod ar draws ychydig o enghreifftiau o 'y cylch creigiau' a 'y cylchred creigiau' - a oes rhywun yn gwybod pa derm sy'n cael ei ddefnyddio gan ysgolion? Diolch yn fawr o flaen llaw. 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