any size group of interacting parts that form a complex whole
What is a system?
1- sun: drives external processes that occur in the atmosphere, hydrosphere, and at Earth's surface. 2- The earth's interior is the second source of energy.
The Earth system is powered by what two sources?
Events taking place in one part can produce changes in all the other parts.
How do we know that Earth's systems are connected?
Nonliving factors include water, air, soil, rock, temperature, humidity, and sunlight.
What are examples of nonliving factors?
Renewable resources can be replenished over a relatively short time span. Nonrenewable resources take millions of years to accumulate.
How do renewable and nonrenewable resources differ?
Earth is a system made up of numerous interacting parts, or subsystems.
Why do scientists study Earth as a system?
Other parts may also change.
If a system is a collection of interacting parts, what happens when one of the parts is changed?
The sources are the sun and reactions in Earth's interior.
What are the two sources of energy that power Earth's system?
Sample answer: contaminating water, polluting air, disposing of toxic waste.
List three ways that humans affect Earth's systems.
It takes too long (millions of years) for the organisms to be converted into oil.
Large numbers of tiny ocean organisms die every day, fall to the ocean floor, are buried, and are eventually converted to oil and natural gas. Why are these two fuels considered nonrenewable?
Roots transport food and water up through the trunk, which holds the tree upright. The trunk transports food and serves as support for branches and leaves. Leaves help keep the tree moist and shaded and release excess water through pores.
Describe the parts of a tree in terms of it being a system.
No, every day you affect at least one of Earth's systems, even on the smallest scale. Simply breathing changes the atmosphere around you or stepping on the grass may affect the biosphere beneath your foot.
Is it possible for humans to have no effect on any of Earth's systems? Explain.
Sample answer: They can analyze an area to see if it is safe to live there. If the land is unstable or subject to flooding, they may make recommendations that people not choose to live there.
How can scientists help to prevent a natural process from becoming an environmental hazard?
How is Earth a system?
is away of looking at Earth as a system made up of several interacting subsystems.
What is Earth a system?
sun and the earths interior
Where does the energy come from that powers Earth's systems?
if it can or cannot be used again.
What makes a resource renewable or nonrenewable?
Images can show scars of landslides, suggesting that the area may not be stable
In Section 1.3, you learned about Landsat satellite imaging. How can data from Landsat help city planners determine where and where not to build?