Answer:
Step-by-step explanation:
A system is a collection of
interdependent parts enclosed within
a defined boundary. Within the
boundary of the Earth is a collection
of four interdependent parts called
“spheres“: the lithosphere,
hydrosphere, biosphere, and
atmosphere. The spheres are so
closely connected that a change in
one sphere often results in a change in one or more of the other spheres.
Such changes that take place within an ecosystem are referred to as events.
Events can occur naturally, such as an earthquake or a hurricane, or they can
be caused by humans, such as an oil spill or air pollution. An event can cause
changes to occur in one or more of the spheres, and/or an event can be the