This week in science we finished learning about rocks and minerals. We finished the contest on the minerals packet. We learned how to find the density of minerals and how to tell the differencs. We had to identify where they were on the hardness scale, cleavage, luster, and color streak. We leaned that sometimes the color streak isn't the same color as the outside color. Some problems that came up while we were doing the packet was we didn't know the exact harness scale so it was hard to place them in order. The measurments on how to find density weren't exact either so we didn't know if it was right.




Also this week we started to learn about physics. We learned about how sometimes you can bemoving and not know it so if you see something you pass, you could think it's moving and you are staying still. Famous scientists strated out with a geocentirc model instead of a heliocentric model because they thought the earth was still and all other planets moved. If they had known the earth moved they would have known that the planets revolve around the sun.



We also learned that if there are two cars and one is moving forwards and one stays still, the car that's moving could think the other car is going backwards. So if something is still, depending on the movement of something else, that something else could still think the stationary object is moving.

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.