Matter and Energy Flow in Organisms

Place a sealed glass terrarium on a classroom windowsill, and to the untrained eye, it appears to be a static display. In reality, it is a roaring engine of atomic exchange. Inside that sealed glass, water vapor rises and falls, invisible gases are inhaled and exhaled, and light from a star 93 million miles away is actively being captured and woven into physical matter. Teachers can use sealed terrariums to model the continuous flow of matter in a closed system, providing a perfect microcosm of Earth itself.

Diagram of a sealed terrarium demonstrating how a closed system acts as a microcosm, allowing matter like water and gases to continuously cycle without escaping.
Diagram of a sealed terrarium demonstrating how a closed system acts as a microcosm, allowing matter like water and gases to continuously cycle without escaping.

To teach elementary science effectively, you must see the world not as a collection of static objects, but as an ongoing dance of matter and energy. Your students will come to you with intuitive—but incorrect—assumptions about how this dance works. Your job is to dismantle those misconceptions and reveal the hidden, mechanical beauty of how organisms survive, process information, and utilize energy from the sun.