Jacqueline~

A rock is a solid structure.

Today in science my class watched a video about three different structures. By the way my class just started a new unit in science which is structures! So we have to write a post that classifies the three types of structures we just learned about. In case you don’t know a structure is just about anything that has different parts and has support. Structures can be built by humans or made naturally. Anyway the classificationsare solid, frame and shell structures. Here are the definitions of each classification.

1. First is solid structures. These structures are normally solid all the way through, meaning that there are no holes or empty space in the construction. These structures can also hold a fair bit of weight and is normally pretty heavy it’s self. A couple good examples of this is a dam or a rock.
2. Next up is frame structures. These are made up of many conected parts that together can hold a lot of weight. If
   

   A spider web is a frame!

   these parts weren’t connected they wouldn’t be able to hold as much weight. These structures need to be well designed to be able to stand up to that much weight. These structures are also lighter in weight compared to solid structures because of the open spaces. They can also have some sort of material covering the frame. Some great examples of this structure are spider webs and umbrellas.

3. Last but not least there are shell structures. These structures have round rigid edged that give them their strength. They are hollow inside but can be filled with things like water and air. These structures tend to be much lighter than most other structures because they are hollow. Some excellent examples are an egg, a tunnel, and an igloo.

A tunnel is a shell structure that is usually used for transportation.

My class talked about another kind of structure. But we didn’t need to include this, yet I did! This is a combination structure. This structure is just two or three of the three classifications combined into one structure. A house or some buildings are combination structures.

I hope you learned a lot about structures so now you can identify the structures around you! I enjoyed writing this post and I hope my teacher Mr. Pepper likes it to because he’s the one that is marking it!

The rock image is from Sergio Tudela on FlickrCC

The spider web image is from Josef. Stuefer on FlickrCC

The tunnel photo is from Ilya Schurov on FlickrCC

This entry was posted on Friday, December 17th, 2010 at 9:36 pm and is filed under School. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.