This week in science we classified cookies and chips. We learned about how there are different kinds of rocks in one whole rock. There are ingrediants on cookies that make a cookie so a rocks and cookies are alike.

We also learned about James Hutton. James Hutton came up with the theory of uniformitarianism. It is the theory that erosion and sedimentation have always been modifying the earth. It also says that erosion and sedimentation happen over a very long period of time. People didn't accept his theory because earthquakes and things like that happened very fast. They changed the earth very fast and his theory said it happens slowly.

We also learned about which rocks are harder then other rocks. Diamond is the hardest rock and Talc is the softest. We learned about the scale id hardness which is called the Mohs Scale. Talc is the softest the next are Gypsum, Calcite, Flourite, Apatite, Quartz, Corundum, and Diamond is the hardest. Talc Gypsum and Flourite can be scratched by a fingernail but the rest are to hard. Diamonds can scratch glass with little effort.