92044 · The Earth system and human-induced change

• Four spheres, one system, sitting in space

  The earth-system is the four interconnected spheres given in this standard: the atmosphere (the layer of gases around Earth, including nitrogen, oxygen, carbon dioxide and water vapour), the biosphere (all living things, and the parts of the system they make up while they are alive), the geosphere (rock, mineral and landform, including the mineral part of soil), and the hydrosphere (all of Earth's water: oceans, rivers, lakes, groundwater, ice and snow). That system exists within space. One sentence is enough; this page does not teach the Sun, the Moon or the seasons. Draw the four as overlapping regions that exchange material, not as four stacked cake layers that never meet. There is no fifth official sphere. Ice is hydrosphere. Humans are biosphere. Lithosphere, cryosphere and anthrosphere are not the words this standard uses.

• Features sit in a sphere, or on a boundary

  A Tasman Sea swell is hydrosphere. The air above it is atmosphere. A living kauri is biosphere; the mineral grains around its roots are geosphere. Some features sit on a join, and the honest answer says so. Soil on a Taranaki ring-plain or in Taupō pumice is mineral from the geosphere, water from the hydrosphere, and living things from the biosphere. Water vapour and clouds are water in the air, so they sit on the atmosphere–hydrosphere boundary. Water in a Canterbury gravel aquifer is hydrosphere; the gravel store is geosphere. Do not call the water geosphere because it sat in rock, and do not call the gravel hydrosphere because it is wet. Franz Josef / Tasman Glacier ice is frozen water, so it is hydrosphere even though it rests on mountain rock.

• A science idea accounts for an effect

  A science idea comes from the science body of knowledge. It is robust yet tentative and supported by verified evidence: a theory, a principle, a law, or a named process or model. You use it to account for an effect, not to rename what happened. 'A lake lost water on a warm afternoon' is an observation. 'Lake water absorbed energy and became vapour, which is the water cycle moving hydrosphere into atmosphere' uses a science idea on the effect. Official models you must be able to point at here are the carbon cycle, the water cycle, energy flow through ecosystems, Earth's energy balance, and the greenhouse effect. Habitat and sedimentation are science ideas used the same way: they name an effect in the system, not a long description of a forest or a slope. Weathering and erosion can be named as ideas; the page that owns why frost shatters rock is Natural Earth processes.

• Matter cycles; it does not vanish

  Matter cycling is the movement of the same material through different spheres, rather than that material appearing or disappearing. The carbon-cycle is carbon moving among atmosphere, biosphere, hydrosphere and geosphere: carbon dioxide in the air, carbon locked in wood and soil, carbon dissolved in water, carbon stored in rock, and carbon returned by respiration, decay, or a volcanic gas. A living Waipoua kauri taking carbon from the air is that cycle. Volcanic carbon from Whakaari or Ruapehu is a natural source; extra carbon from burning fossil fuels is the later human-induced page. The water-cycle is water moving as liquid, ice and vapour: evaporation, condensation, precipitation, infiltration and runoff, travelling across geosphere and through biosphere as it goes. Soil leaving a slope and entering a river is a transfer of geosphere material into the hydrosphere. The trace is the skill. Why that particular slope failed is the next page.

• Energy flows; the greenhouse effect warms the air

  Energy flow in the Earth system is energy arriving from the Sun, moving through atmosphere, hydrosphere, geosphere and living things, and leaving again as infrared radiation. Keep it at Earth-system scale: carbon and energy moving through living things, not a microorganism life-process lesson. Earth's energy balance is the comparison between incoming solar radiation and outgoing infrared that sets how much energy the system keeps. Dark volcanic rock on Tongariro absorbs more of the incoming sunlight than a snow patch on the same ridge, so the rock warms more. The greenhouse-effect is the process by which gases in the atmosphere absorb some of that outgoing infrared and so keep the Earth system warmer than it would be without them. That is the process that connects atmosphere to energy. The later page owns the enhanced greenhouse effect as a climate-change case. Do not calculate. There is no formula on this standard.

• A diagram or table is evidence of a transfer

  A simple sphere sketch of Aotearoa, a water-cycle or carbon-cycle diagram, or a short constructed table is a representation of transfers, not a decoration. Read it as: what left, what arrived, and which sphere each store belongs to. A classroom-rounded table that shows lake water falling while vapour above the lake rises is evidence that hydrosphere became atmosphere. Quote the figure you were given. Do not invent a carbon stock, a sediment load or a temperature series for a real site, and do not turn the reading into a calculation. Food webs, pyramids of biomass and water-quality surveys used to analyse a human-induced change belong on Human-induced change. Here the skill is to see a transfer in the picture.

• Other knowledge systems sit alongside the model

  Apply the four-sphere model alongside mātauranga Māori, Pacific and other knowledge systems. The shared idea is connection, not a competition between stories. Ranginui and Papatūānuku name a connected sky and earth; that pairing sits next to atmosphere and geosphere exchanging water and carbon, rather than four sealed layers. Te Awa Tupua is the public legal framing of the Whanganui River as one whole. The statute treats the river as an indivisible living whole, not as water cut off from banks and living things. The science model is pointing at the same fact: river water, sediment and bed, living things, and the air exchanging vapour are one system. Do not invent an iwi or hapū position beyond that public framing, and do not turn the paragraph into advice about what a council should do.

• Name the transfer, not just the event

  A natural-earth-process is a transfer of matter or energy that is not driven by a human activity. “A volcano happened” is a label. “Ash and gas left the crater and entered the air; heat left the magma and warmed the crater lake” is a process. Classroom drivers you should be able to use include earthquakes, volcanoes, tsunami, extreme weather, weathering and erosion, landslides, and coastal storm waves. That set is for teaching, not a quotation from the standard. The standard later asks you to link a natural process to a human-induced change. This page first makes the natural process speakable.

• Weathering, erosion and deposition are three steps

  Weathering breaks rock where it sits. Water in a Southern Alps crack expands as ice and pries the rock apart; roots and weak acids do the same more slowly. Erosion is the movement of that loose material by water, ice, wind or gravity — a flood in the Waimakariri picking up gravel, a storm wave undercutting a cliff, a slip racing down a wet slope. Soil erosion is that idea applied to soil. Deposition is the settling when the carrier slows: gravel dropped on a Canterbury floodplain, sand left after a wave retreats. If you use the three words as if they mean “the hillside changed”, you have not yet said what moved.

• The water cycle is a set of transfers

  The water-cycle does not create or destroy water. Water evaporates from a lake or a wet canopy when it absorbs energy and becomes vapour. It condenses into cloud when that vapour cools, and the stored energy is released as heat. It then falls, soaks into soil and rock, or runs off into a river. Snow on the Southern Alps is a store; meltwater in the Tasman or the Waimakariri is the same water on the move. A rain-shadow east of the Alps is the same cycle after moist air has already dropped most of its water on the windward slopes. Quote a table of millimetres as evidence of which transfer dominated. Those millimetres are teaching data, not a published climate record.

Internal · marked per part.

This is an internal achievement standard. Whetū does not offer a sit-down Exam paper for it. Learn and Practise stay available.

3 authored Learn units for this standard.

• The four spheres of the Earth system

  This page first-teaches the Earth system you will use for the rest of Standard 92044: four interconnected spheres, atmosphere, biosphere, geosphere and hydrosphere, existing within space. One clause on space is enough. Day and night, seasons, tides and the Moon belong to a later standard. Here the work is to name the system, place a feature, and watch matter and energy move.

• Natural Earth processes

  A landslide after heavy rain on a West Coast hillside, ash from Ruapehu settling on a stream, and snow on the Southern Alps becoming river water are the same kind of science. Each is a natural Earth process: matter or energy moving through the Earth system without a human activity as the driver. This page teaches that baseline. The standard you will eventually write for is still human-induced change, so a volcano or a flood is not enough on its own.

• Human-induced change

  This standard asks you to name a human-induced-change and put science ideas on its effects in the earth-system. A human-activity is the driver — mining, horticulture, agriculture, burning fossil fuels, making plastics, changing how land is used. The change is what that activity does to the system: more carbon in the air, a slope without trees, a catchment paved over, or a stream bank replanted. The job is not the change.

34 Practise questions in “The Earth system and human-induced change”. Feedback here is formative and is not an official NCEA grade.

• Four spheres

  Name atmosphere, biosphere, geosphere, hydrosphere and place a feature.

• Features on a join

  Ice and aquifer water stay hydrosphere; soil and vapour sit on a boundary. No fifth sphere.

• Cycles and energy flow

  Carbon cycle, water cycle, greenhouse effect as a process. A table is evidence of a transfer.

• Name the transfer

  Event versus process. Matter or energy, and the direction.

• Weathering, erosion, deposition

  Three different steps, not three names for “the hillside changed”.

• Natural mechanisms

  Water cycle, carbon pathway, natural greenhouse, energy balance as mechanisms. Do not calculate.

• Activity is not the change

  The job (clearance, burning, planting) is not the Earth-system change.

• Science on the effects

  Put the science idea on effects. Changes can help as well as harm.

• Across spheres

  An effect in one sphere forcing an effect in another. Climate change as one case. Evidence is a quoted pattern.

Sample questions

1. Which list is the four official spheres of the Earth system in this standard?
2. Match each feature to the sphere it belongs to.
3. Which student is correct?
4. A student writes that the ice, the soil and the steam are all features on a join. What is the honest correction?
5. What is wrong with that account?
6. A student is asked where soil on a Central Otago terrace sits in the four-sphere model. Which placement is honest?
7. Place the steam and the mineral spray in the four-sphere model. Do not force either into a single official home.
8. What is happening to that carbon in the Earth system?

Practise 92044 in Whetū