Guided virtual science experiments for Grades 6–10. Free experiments need no account.
13 experiments found
The Sun drives the water cycle of evaporation, condensation and precipitation
Shine a lamp on water in a covered tank with ice on the lid. Watch evaporation, condensation and rain happen in a small model of the water cycle.
Water quality can be compared using appearance, pH and hardness tests
Compare tap, well, river and pond water by appearance, pH and hardness, using distilled water as a control.
Soil is a mixture of particles of different sizes and organic matter
Shake three soil samples with water and let them settle into layers of gravel, sand, silt and clay, with humus floating on top. Compare garden, river and clay soils.
Energy flows from producers through consumers in a food chain; only about a tenth of the energy passes to each next level
Build a food chain from organisms found around a Nepali paddy field, place each at its feeding level, and follow how energy is lost at every step.
Decomposers such as bacteria and fungi break down dead organic matter fastest when it is warm and moist; plastic is not biodegradable
Leave fruit peel, leaves, paper and plastic in sealed jars of soil, change the moisture and temperature, and measure how much decomposes over four weeks.
Biodegradable waste is broken down by decomposers into harmless substances; non-biodegradable waste stays in the environment for hundreds of years
Find out what happens to different kinds of waste buried in soil for three months, and sort household waste into biodegradable and non-biodegradable.
Settling and filtering remove particles; only disinfection makes water safe from germs
Clean muddy river water step by step: let it settle, filter it, then kill the germs by boiling or with a chlorine tablet.
Fine-grained soils with humus hold more water than sandy soils
Pour the same amount of water through sandy soil, garden loam and clay soil in funnels, and measure how much drains through each.
Biodiversity can be compared by sampling with quadrats; more samples find more species until the count levels off
Place 1 m quadrats in a school field, at a forest edge and on a trampled path, count the plant species, and find how many quadrats are enough.
Fertilisers raise yields only up to a point; extra nitrogen washes into rivers and harms them, and pesticides harm useful creatures too
Decide how much fertiliser to put on a rice field, chemical or compost, whether to spray pesticide, and see the effects on the harvest, the soil and the river.
Renewable sources vary with the seasons; Nepal's rivers make micro-hydro powerful, while solar and wind can fill gaps
Choose solar panels, wind turbines or a micro-hydro plant for a 60-home village in Nepal's hills, and see how much energy each gives in winter, the dry spring and the monsoon.
Running water carries soil away fastest on steep, bare slopes; plant cover, mulch and terraces slow the water and hold the soil
Pour rain onto trays of soil on different slopes, bare or protected by grass, mulch or terraces, and weigh the soil washed away.
Greenhouse gases such as carbon dioxide let sunlight in but trap heat radiated from the ground, warming the Earth
Shine a lamp on an open jar, a covered jar and a covered jar of extra carbon dioxide, and compare how warm each gets.