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A pond, a field, a forest. Each one follows the same few rules.

This is Chapter 13, Our Environment. It is the last chapter of your Science book.

What you will learn

• An ecosystem, and its parts. Living things and non-living parts.
• Producers, consumers and decomposers. Make food, eat food, feed on the dead.
• Food chains and food webs. Who eats whom, and how chains cross.
• Trophic levels. Each step in a food chain has a number.
• The flow of energy. A small part passes to the next level.
• Biological magnification. Some chemicals build up more at each level.
• Ozone depletion. Depletion means thinning of the ozone layer, high up.
• Managing garbage. Sorting waste that rots from waste that does not.

One rule before anything else

Every bench in this track is a simulation. It says so on its own panel. Nothing here asks you to handle real waste, chemicals, or fire. All the sorting, walking and switching happen on screen, with stated numbers.