The phosphorus cycle

https://www.sciencelearn.org.nz/resources/961-the-phosphorus-cycle
Phosphorus is a chemical element found on Earth in numerous compound forms, such as the ...

Heat energy

https://www.sciencelearn.org.nz/resources/750-heat-energy
Most of us use the word ‘heat’ to mean something that feels warm, but science defines heat as ...

The nitrogen cycle

https://www.sciencelearn.org.nz/resources/960-the-nitrogen-cycle
Nitrogen is the most abundant element in our planet’s atmosphere. Approximately 78% of the ...

Humans and the water cycle

https://www.sciencelearn.org.nz/resources/726-humans-and-the-water-cycle
We are becoming increasingly aware of our impacts on nature, but unfortunately many of the ...

Non-Newtonian fluids

https://www.sciencelearn.org.nz/resources/1502-non-newtonian-fluids
Many people have heard of Sir Isaac Newton. He is famous for developing many scientific ...

What is fire?

https://www.sciencelearn.org.nz/resources/747-what-is-fire
Fire is the visible effect of the process of combustion – a special type of chemical reaction ...

Positive and negative effects of UV

https://www.sciencelearn.org.nz/resources/1304-positive-and-negative-effects-of-uv
The Earth’s atmosphere blocks most of the Sun’s UV radiation from penetrating through the ...

States of matter

https://www.sciencelearn.org.nz/resources/1499-states-of-matter
Anything that has mass is made up of matter – an all-encompassing word for atoms and molecules ...

Measuring biodegradability

https://www.sciencelearn.org.nz/resources/1543-measuring-biodegradability
In nature, different materials biodegrade at different rates. If you throw your apple core into ...

Uses for UV

https://www.sciencelearn.org.nz/resources/1305-uses-for-uv
There are a variety of ways we put ultraviolet (UV) radiation to good use. Our skin and UV When ...

Food’s journey through the digestive system

https://www.sciencelearn.org.nz/resources/1849-food-s-journey-through-the-digestive-system
A look at the time it takes for food to pass through the gut from mouth to anus. In a healthy ...

Soil properties

https://www.sciencelearn.org.nz/resources/957-soil-properties
All soils contain mineral particles, organic matter, water and air. The combinations of these ...

Cleaning up the oil spill

https://www.sciencelearn.org.nz/resources/1140-cleaning-up-the-oil-spill
On 5 October 2011, the cargo vessel Rena ran aground on the Astrolabe Reef. The ship was ...

Macronutrients

https://www.sciencelearn.org.nz/resources/534-macronutrients
Nutrients are substances needed for growth, energy provision and other body functions ...

Enzymes in washing powders

https://www.sciencelearn.org.nz/resources/1947-enzymes-in-washing-powders
Television commercials for washing powder often promote the "boosting power" of enzymes. Why ...

What is smoke?

https://www.sciencelearn.org.nz/resources/748-what-is-smoke
What is smoke and why do some fires seem to have more smoke than others? Smoke is a collection ...

Digestion – breaking the large into the small

https://www.sciencelearn.org.nz/resources/1830-digestion-breaking-the-large-into-the-small
Digestion of food involves both physical and chemical processes. Through digestion, large food ...

What is the Earth system?

https://www.sciencelearn.org.nz/resources/1256-what-is-the-earth-system
There are many interacting systems that make up the Earth, many of which are dynamic. These ...

Earth system

https://www.sciencelearn.org.nz/resources/720-earth-system
Trying to understand how this planet we call home works can seem confusing – there are so many ...

Melting and freezing

https://www.sciencelearn.org.nz/resources/608-melting-and-freezing
Water can exist as a solid (ice), liquid (water) or gas (vapour or gas). Adding heat can cause ...

Carbonate chemistry

https://www.sciencelearn.org.nz/resources/469-carbonate-chemistry
Calcium carbonate is the principal mineral component of limestone. Its chemical and physical ...

The human digestive system

https://www.sciencelearn.org.nz/resources/1829-the-human-digestive-system
The human digestive system consists of a long muscular tube and several accessory organs such ...

Fire behaviour

https://www.sciencelearn.org.nz/resources/763-fire-behaviour
Fires behave differently. Some burn slowly and evenly; others are extremely hot, burning ...

Non-renewable energy sources

https://www.sciencelearn.org.nz/resources/1570-non-renewable-energy-sources
Energy comes from many sources, and to describe these sources we use two terms: renewable and ...
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