Predicting Soil Composition

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Objective

SWBAT use evidence from resources to support predictions regarding soil composition.

Big Idea

Groups will collect soil samples from the schoolyard, and make predictions about what the soil is composed of based on the information they have found.

Introduction

5 minutes

I would recommend teaching this lesson after students learn the components of soil, such as through my Describing Soil lesson.  The investigation is completed in the lesson Analyzing Soil.

I begin by explaining that one of the main reasons we want to know what types of soil we have is because certain types of plants grow better in certain types of soil, and as I remind my students, I have always wanted to begin a garden at school.

I inform students that we'll be going outside to collect soil samples.  I assign students jobs for this investigation, a "getter" to get materials, a "chooser" to pick a location, a "digger" to do the digging, and a "shaker" to shake the sample.  I remind them of expectation during outdoor investigations, and take them outside to collect samples.  They need to bring trowels and Ziplock bags outside with them.

 

Collecting Samples

5 minutes

I allow "choosers" to take their groups anywhere they like on the playground, as long as I can see them.  At our school, due to the hard clay of Arizona soil, most groups found their way to wherever there was mud because it was easier to dig in (and I forgot the shovels!)

Once they get their samples in their bags, we line up and head back outside.

Engagement

20 minutes

Once we are back inside, I have them label their samples, and continue with the procedures.  I ask them to think about what resources they could use to support their predictions.  In my room, most students went for their How do we describe soil? organizers, and some went back to their science textbooks.  There were equally appropriate.