What Does Meteor Size Have to Do with Crater Size?
This inquiry based field experiment will allow students to discover what causes meteors to make craters that are much larger than the meteor themselves. They will also find how meteors of different shapes and sizes will create varying craters. Students will use different objects and different mediums to create a variety of meteors and craters. Students will work together to discover answers to questions that they come up with.
Key concepts for this lab include: Craters are caused by meteors much smaller than themselves. Events happening naturally can be duplicated with similar results in a laboratory setting.
Vocabulary for this lesson includes: meteor, crater, impact
Context for Use
Resource Type: Activities:Field Activity:Field laboratories
Special Interest: Field-Based Teaching and Learning, Hazards
Grade Level: College Lower (13-14):Introductory Level, High School (9-12), Middle (6-8)
Theme: Teach the Earth:Enhancing your Teaching:Teaching in the Field, Teach the Earth:Teaching Environments:Intro Geoscience, Teach the Earth:Course Topics:Planetary Science, Teach the Earth:Incorporating Societal Issues:Hazards
Earth System Topics: Solar System and Astronomy
Description and Teaching Materials
Once the class is at the site, tell students that they will be making observations of their objects and the area around them. We are trying to find some questions that students may have. Give students 7-10 minutes to make some observations using their materials and the area around them. Have them make at least 10 observations and write them in journals or in their notebooks. (The number of observations can vary depending on how often students have done observations. Remind them that it is always good to have a detailed description of what they did to find their answers. Once the time is up, re-convene and discuss what people found. One of the main topics that most students should find is the fact that crater size is always larger than meteor size. This is the main idea that I have had my students learn about. There are many other reasons that craters are the way they are. If students think of one of those and want to experiment, let them. There are no wrong questions that can be answered here.
Once groups find their question that they want to ask, they need to design an experiment. Make sure they know what a good experiment involves. (It might be a good idea to go through the scientific method with the class before introducing this lab, if the class does not have a good grasp on it already.) The experiments should start with the purpose, in this case, "We want to find out if meteor size has to do with crater size?" Remember, these can vary from your students a bit. Materials should be listed, as well as the procedure. (One thing I routinely mention to my students is that their procedure should be clear enough so someone can use their lab write-up and re-do the lab exactly as they did it.) A table should be made showing the results of the experiment. Most experiments are done with numerous trials and an average being found. Definitely do that here too. All good experiments show a chart of data found and graphs work well to visualize and compare data. A conclusion must be at the end of the experiment.
Teaching Notes and Tips
- If you are going to a large area, bring a whistle; it is good for getting the students' attention.
- Tell the administration where you are going and when.
- If you are going off school grounds make sure you have administrations permission.
- Same sex groups work well because there will be no "jobs for the girls and jobs for the boys".
- Try to get a variety of different materials to act as meteors. I like to use the different sports balls because they are easily accessible from P.E. Also, get some other objects (Meteors are never perfectly spherical).
- I have never done this experiment outside with my students creating the experiment. It has worked very well inside the classroom with marbles and small trays of sand.
- One thing that most students do not think about when doing experiments is keeping certain aspects set, like the force the meteor hits at or the distance. If they are looking solely at the size of the crater formed, the other variables must be set.
9-12.III.C.2-characteristics of planets