density and molecules

This week we learned about how water molecules work. When they are warm they move around alot. When they are cold they stay still. Mr. Finley put water in a glass bottle and then put a cork on top. He then put it over a flame and the cork flew off. This is because the water molecules moved up and pushed the cork off. He also put water in a bottle lew out a flame into it. Then he squeesed the bottle and when he let go, there was fog. This is because when there is more presure the particles move faster and there is evaporation. When there is low presure the particles go slow and there is less condensation or no fog. We also learned about density. Volume is how much space something takes up. If something is filled with particles and they are PACKED IN, IT IS DENSE AND HAS MORE mass.( sorry for the caps lock).

Classifications and Symbiotic Relationships.

This week I finished watching the documentaries. On the website I learned about all of the different skulls and what they ate . It was pretty interesting because some species ate fruits and nuts, while another ate meat. We also started learning about how species are catagorized. A man named Carolous Linnaeus camed up with this naming of species. He maned each species by two names. This system is called Binomial Nomenclature. for example, the scientific name for a human is called a homo sapien. His real name is Carl Linny. He changed it to its latin form just like he names species. We also learned about Symbiotic Relationships. There is parisitic which means that the host of the organism gets a negative effect and the other organism gets a posotive effect . For example, and mousquito gets blood from a host and the the host loses blood. Mutalistic is when the host gets a posotive effect and the organ ism gets a posotive effect. For example, an elefant can have birds on it that eat the bugs bothering the elephant. The bird gets to eat, and the elephant is free of flies.