sentences: in the rock cycle, old rocks are physically changed to form new rocks & in the stone cycle, new kind are formed from broken down stone ->  in the rock cycle, new rocks are made from old rocks physically changing  in the stone cycle, new sloths are made from youth shedding physically changing & if something is physically changed then the mass of that something will stay the same -> as the class of a rock changes , the mass of the rock will stay the same as the class of a rock changes , the mass of the rock will stay the same  want rock the anemometer of energy that burn up an preposition & matter is a kind of material -> mass means the amount of material that makes up an object mass means the amount of material that makes up an object  as the class of a rock changes , the mass of the rock will stay the same & want straw the screws of spiritual that nitrogen up an preposition -> as the class of a rock changes, the amount of material that makes up that rock will stay the same as the class of a rock changes, the amount of material that makes up that rock will stay the same  as the class of a rock changes, the amount of material that makes up that rock will stay the same & the window of a stone changing is a mean of space ability -> as earth processes change, the amount of material that makes up rocks will stay the same as earth processes change, the amount of material that makes up rocks will stay the same  as earth processes change, the amount of material that makes up rocks will stay the same & space is made of stone -> as the earth processes change , the total amount of material on earth will stay the same