Compost Connections: Energy and Matter

Exploring Life Cycles and Energy Flow Grade 4 Science 45-Minute Garden Adventure

What is Composting?

Nature's recycling system Breaks down old plants and food scraps Creates rich soil for new plants Helps complete the circle of life

Where Does Our Food Come From?

Think about your breakfast this morning What plants or animals did it come from? How do plants get their energy to grow?

The Sun: Our Ultimate Energy Source

All energy on Earth starts with the Sun Plants capture sunlight through photosynthesis Animals get energy by eating plants or other animals Even decomposers use energy from the Sun

Energy Flow in Ecosystems

Ecosystem Roles

{"left":"Producers: Plants that make their own food using sunlight\nPrimary Consumers: Animals that eat plants (herbivores)","right":"Secondary Consumers: Animals that eat other animals (carnivores)\nDecomposers: Break down dead plants and animals"}

Let's Make Compost!

We'll go outside to our school garden Add 'green' materials: fruit scraps, fresh leaves Add 'brown' materials: dry leaves, paper Look for decomposers: worms, bugs, fungi

Meet the Decomposers

Earthworms: Nature's recyclers Bacteria: Microscopic helpers Fungi: Break down tough materials Insects: Speed up the process

The Cycle of Matter

Dead plants and animals become compost Compost adds nutrients to soil Plants use nutrients to grow The cycle continues forever!

Create Your Food Web Poster

Draw the Sun at the top Add producers (plants) Include consumers (animals) Don't forget decomposers! Use arrows to show energy flow

Garden Life Cycle Project

We'll plant radish and bean seeds Track growth for one month Document each stage: germination, sprouting, seedling, flowering, seed formation Use worksheets to record observations

Remember

Energy flows from the Sun through all living things Matter cycles through ecosystems Decomposers are essential for life on Earth We are all connected in the web of life!