|Pebbles, Sand, and Silt Overview
PEBBLES, SAND, AND SILT
The Pebbles, Sand, and Silt Module consists of four sequential
investigations, each designed to introduce concepts in earth science.
The investigations provide experiences that heighten students’
awareness of rocks as earth materials, natural resources, and fossils.
They will come to know rocks by many names and in a variety of
sizes. Pebbles, sand, and silt are the same material—just different in
FOSS EXPECTS STUDENTS TO
• Develop a curiosity and interest in the natural world
• Observe, describe, and sort earth materials based on
• Observe the colorful minerals in granite using a hand lens
and learn that rocks are made of minerals.
• Separate earth materials by size, using different techniques.
• Observe the similarities and differences in the materials in
a river rock mixture: silt, sand, gravel, and small and large
• Learn that smaller rocks come from the breakdown of
• Explore places where earth materials are found and ways
that earth materials are used.
• Compare the ingredients in different soils.
• Compare the properties of soil, including texture, color, and
ability to retain water.
• Learn about fossils and what they tell us about the past.
• Organize and communicate observations through drawing
• Write or draw a sequence of steps for an investigation.
• Construct bar graphs to record data.
• Use metric tools to weigh rocks and measure volumes of
• Acquire the vocabulary associated with earth materials.
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