Sediment Jar
Goal:
Watch how sediments settle in water and form layers, just like sedimentary rocks.

Materials:

• Clear jar or plastic cup with lid
• Water
• Different sediments (sand, dirt, small pebbles, clay, or even bits of crushed leaves)
• Spoon or stick for stirring
• Paper and pencil to draw and describe layers

Instructions:

1. Fill the jar halfway with water.
2. Add a spoonful of each sediment type, one at a time.
3. Stir the water to mix everything up.
4. Put the lid on tightly and shake the jar gently.
5. Set the jar down and watch carefully for several minutes or hours.
6. Observe how the sediments start to settle into layers.
7. Draw what you see and write a sentence or two about the layers.

What’s Happening?
Heavier sediments like pebbles and sand settle first at the bottom. Lighter ones like clay or bits of leaves settle on top. Over time, layers build up, just like how sedimentary rocks form from sediments in real life.

Questions to Think About:

• Which sediments settled fastest?
• What do the layers tell us about where the sediments came from?
• How might these layers turn into rock someday?

 
Further Scientific Exploration

Goal: Understand sedimentation processes and how sediments compact into sedimentary rock.

Additional Vocabulary:

• Sediment: small pieces of rock, soil, or organic material.
• Sedimentation: the process of sediments settling out of water or air.
• Compaction: squeezing sediments together over time.
• Cementation: minerals binding sediments into rock.

Steps:

1. Repeat the steps above.
2. After observing layers, research or discuss how compaction and cementation transform these layers into sedimentary rock over millions of years.
3. Consider what different sediment sizes tell us about the environment they came from (fast-moving water vs. calm lake).

Deeper Questions:

• Why do heavier sediments settle faster than lighter ones? (Think about gravity and particle size.)
• How does sediment size and layering help geologists read Earth’s history?
• What role does water play in transporting sediments and shaping layers?
• How might fossils be preserved in these layers?