Apollo 17 astronauts captured this snapshot of the Earth system on their way to the moon in 1972. Essentially everything that was a part of the system.

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Apollo 17 astronauts captured this snapshot of the Earth system on their way to the moon in Essentially everything that was a part of the system then is still a part of the system today— that's why it's considered a closed system. All of the matter (solid, liquid, and gas) and all of the processes that move energy and materials from one part of the planet to another make up the Earth system.

Studying the Earth as a set of complex, interactive systems, and the movement of energy and matter among the systems.

1. Looking at the image, what are the major parts of our planet that can interact as a system?

Four major parts of Earth work together as a complex system: rocks, water, air, and life. On a global scale, each part can be thought of as a sphere, roughly the same size and shape as the planet. The four parts are called the geosphere, hydrosphere, atmosphere, and biosphere.

2. Describe each of Earth's four spheres. List several examples of features in each sphere. 3. Do you think clouds should be classified as part of the atmosphere, or part of the hydrosphere? Explain why.

The surface of the geosphere, where the rocky part of our planet is in contact with water, air, and/or life is generally where the spheres intersect and affect each other. The processes that move matter and energy from one sphere to another are called sphere interactions.

Several examples of sphere interactions can be inferred from this photograph: Humans (biosphere) built a dam out of rock materials (geosphere). Water in the lake (hydrosphere) seeps into the cliff walls behind the dam, becoming groundwater (geosphere), or evaporating into the air (atmosphere). Humans (biosphere) harness energy from the water (hydrosphere) by having it spin turbines (geosphere) to produce electricity.

What sphere interactions can you infer from this photograph? To identify sphere interactions, think of one feature in the image at a time, decide which sphere it is a part of, then consider how it interacts with the other spheres.

The interactions you've been describing are the processes of Earth system science. The current "balance" among these complex interactions makes it possible for life to flourish here. Because the spheres are all part of the same interconnected system, changes in any sphere ultimately affect the other spheres as well. What effect do you have on the Earth system? As a part of the biosphere, think of some ways that you change the atmosphere, hydrosphere, or geosphere.

5. List some Earth sphere interactions that result from your own daily activities.

Everything that happens on our planet is part of a complex set of interactions between air, water, land, and life. Earth system science encompasses all these interactions with a new focus on the connections among topics that were once studied separately. All Earth system science is ultimately focused on the question "How is the Earth changing and what are the consequences for life on Earth?"

Examples of System Interactions: