## Reflection: Rigor The Distribution of Water on Earth - Section 3: Explore

Using Scale Models to Illustrate Size, Quantity, and Proportion

Models have many purposes in the scientific world. Many scientists use them to show and explain ideas, patterns, and observations. They also use them when designing prototypes, asking questions, or explaining data. There are all kinds of models out there to use that sometimes it can be confusing to know which one to use or how to use it for a particular lesson.  Some models involve scaling, either up or down, to give students a sense of reality of just how large or small something can be and used to explain a certain phenomenon.

Models vary in form as some are linear, 2d, 3d, or may even be a chart, graph, or illustration.  It really depends on the purpose or intent of the model.  One key point about models is that some can be misleading and often misinterpreted so it’s important to figure out which one works for the concept being represented and explained. A good way to determine if a model is suitable for a topic is if it can be used to make predictions, explanations, and illustrate consistency with other scientific information and facts out there. And it’s important to know that there can be more than one kind of model to represent the same idea or concept

I use a variety of models all the time with my students as I find they help students learn and grapple with difficult concepts. They are a great way of taking abstract ideas and make them concrete. In this lesson, I had students create scale models to observe the distribution of water on Earth to give an accurate representation of just how much and what kind of water is on Earth. It gave students a realistic view of how water cannot be used for consumption and just how little is available for it.

Using Scale Models to Illustrate Size, Quantity, and Proportion
Rigor: Using Scale Models to Illustrate Size, Quantity, and Proportion

# The Distribution of Water on Earth

Unit 7: Water On Earth
Lesson 2 of 5

## Big Idea: Students will create a model and graph to illustrate the distribution of water on Earth.

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Standards:
Subject(s):
hydrosphere, Science, Distribution of water on earth, Earth's Systems, water cycle, Hydrosphere, water systems
60 minutes

### Carrie Boyden

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