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 ...

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 ...

Solids, liquids and gases

https://www.sciencelearn.org.nz/resources/607-solids-liquids-and-gases
Water is the only common substance that is naturally found as a solid, liquid or gas. Solids ...

Marine food webs

https://www.sciencelearn.org.nz/resources/143-marine-food-webs
Feeding relationships are often shown as simple food chains – in reality, these relationships ...

Ocean salinity

https://www.sciencelearn.org.nz/resources/686-ocean-salinity
There are many chemicals in seawater that make it salty. Most of them get there from rivers ...

Human impacts on marine environments

https://www.sciencelearn.org.nz/resources/144-human-impacts-on-marine-environments
Throughout human existence we have relied on the oceans – for food, as a waste dump, for ...

Adaptations of marine organisms

https://www.sciencelearn.org.nz/resources/142-adaptations-of-marine-organisms
Adaptation is an evolutionary process whereby an organism becomes increasingly well suited to ...

Human impact on rivers

https://www.sciencelearn.org.nz/resources/440-human-impact-on-rivers
Human beings have an impact on river ecosystems. The relationship living organisms have with ...

Macronutrients

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

Ocean dissolved gases

https://www.sciencelearn.org.nz/resources/688-ocean-dissolved-gases
Seawater has many different gases dissolved in it, especially nitrogen, oxygen and carbon ...

River ecosystems

https://www.sciencelearn.org.nz/resources/439-river-ecosystems
The ecology of the river refers to the relationships that living organisms have with each other ...

The water cycle

https://www.sciencelearn.org.nz/resources/721-the-water-cycle
The Earth has a finite amount of water. The water that is here today is the same water that ...

Ocean density

https://www.sciencelearn.org.nz/resources/687-ocean-density
The density of seawater plays a vital role in causing ocean currents and circulating heat ...

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 ...

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 ...

Ocean temperature

https://www.sciencelearn.org.nz/resources/707-ocean-temperature
The temperature of the ocean determines what form the water takes. Most of the ocean is liquid ...

Fire behaviour

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

Environmental conditions affecting the sea

https://www.sciencelearn.org.nz/resources/141-environmental-conditions-affecting-the-sea
On land, the most important environmental conditions affecting organisms are rainfall and ...

Bioindicators

https://www.sciencelearn.org.nz/resources/1538-bioindicators
A bioindicator is a living organism that gives us an idea of the health of an ecosystem. Some ...

Classifying marine organisms

https://www.sciencelearn.org.nz/resources/140-classifying-marine-organisms
Classification is an important tool used by scientists to show how organisms are related to ...

Water and ice

https://www.sciencelearn.org.nz/resources/1008-water-and-ice
Looking down at the Earth from space, you can get an idea of just how much water there is. In ...

Water density

https://www.sciencelearn.org.nz/resources/1009-water-density
Water density changes with temperature and salinity. Density is measured as mass (g) per unit ...

Water and weather

https://www.sciencelearn.org.nz/resources/725-water-and-weather
The water cycle is driven by energy from the sun. Liquid water is evaporated and changed into a ...

Ecosystems

https://www.sciencelearn.org.nz/resources/993-ecosystems
What is an ecosystem? An ecosystem is made up of animals, plants and bacteria as well as the ...
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