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Analyze
Earth Systems

Explore how Earth's four spheres interact, cycle matter and energy, and produce natural hazards.

GED Science

The Four Spheres

Earth is a single connected system made of four major parts, called spheres. Each one stores matter and energy, and all of them constantly exchange material with the others.

Atmosphere
The layer of gases surrounding Earth (air).
Hydrosphere
All of Earth's water: oceans, rivers, ice.
Geosphere
The solid Earth: rock, soil, and the interior.
Biosphere
All living things, from microbes to whales.

Systems Interact

Atmosphere Hydrosphere Geosphere Biosphere

An Everyday Example

A single rainstorm shows all four spheres working together:

1
Atmosphere: Clouds form and release rain.
2
Hydrosphere: Rainwater flows into rivers and soaks the ground.
3
Geosphere: Water erodes rock and moves soil downhill.
4
Biosphere: Plants absorb the water and grow.

The Driving Energy

Two energy sources power all Earth systems. Their balance, the energy budget, controls climate and weather:

Solar Energy
Sunlight drives the water cycle, winds, and weather.
Internal Heat
Heat from Earth's interior drives plate tectonics and volcanoes.

Matter Cycles

Energy flows through Earth and is lost to space, but matter is conserved; it cycles endlessly between the spheres.

The Water Cycle Ocean Condensation Evaporation Precipitation Clouds

Weather vs. Climate

A common point of confusion: weather and climate describe the same atmosphere but over very different timescales.

WeatherClimate
TimescaleHours to daysDecades or more
ExampleToday's rainAverage yearly rainfall
MeasuresSingle eventsLong-term patterns
ChangesQuicklySlowly

Natural Hazards

A natural hazard is a natural event that can harm people or property. Most hazards come from the energy that drives Earth systems.

Geosphere
Earthquakes, volcanoes, landslides.
Atmosphere
Hurricanes, tornadoes, droughts.
Hydrosphere
Floods, tsunamis.

How to Analyze a System

1
Identify the spheres involved in the event.
2
Trace the energy source (solar or internal heat).
3
Follow the matter as it cycles between spheres.
4
Predict the effects on other spheres and on people.

Example 1: A Volcano Erupts

Geosphere Ash to Atmosphere

Example 2: A Hurricane Forms

Warm Ocean (Hydrosphere) Eye Atmosphere

Example 3: Cause-and-Effect Chain

Earthquake (Geosphere) Tsunami (Hydrosphere) Flooding (Biosphere)

Common Mistakes

✕ Confusing weather and climate
A cold day does not disprove a warming climate; one is short-term, the other long-term.
✕ Thinking spheres are separate
The spheres always interact; an event in one affects the others.
✕ Confusing matter and energy
Matter cycles and is conserved; energy flows through and is lost to space.

Hazard Summary

HazardEnergy SourceMain Spheres
VolcanoInternal heatGeo → Atmosphere
EarthquakeInternal heatGeosphere
HurricaneSolarHydro → Atmosphere
FloodSolarHydro → Biosphere
DroughtSolarAtmosphere → Bio

Question 1 of 5

Which sphere includes all living organisms on Earth?

Question 2 of 5

A volcanic eruption is mainly powered by which energy source?

Question 3 of 5

Which statement correctly distinguishes weather from climate?

Question 4 of 5

A seafloor earthquake displaces ocean water and creates a tsunami that floods a coast. How many spheres are directly involved in this chain?

Question 5 of 5

In Earth systems, which statement about matter and energy is correct?

You Can Now Analyze Earth

✓
Name the four spheres and describe how they interact.
✓
Trace energy (solar vs. internal) and matter cycles.
✓
Distinguish weather from climate.
✓
Predict how a natural hazard affects multiple spheres.