I
n scientific terms, a system is any set of interactions that can be
separated from the rest of the universe for the purposes of study,
observation, and measurement. Therefore, a s ystem is so mething
in wh ich t he va rious pa rts f it t ogether a nd sea mlessly w ork i n
harmony. Earth has four major systems that work together. These
systems a re i dentified a s t he h ydrosphere, t he a tmosphere, t he
lithosphere, and the biosphere.
Of all the planets in our solar system, Earth stands out because
of the presence of water. When viewed from space, the first notable
feature about our planet is its blue color. This color comes from the
oceans of water that cover more than 70% of its surface. No other
planet in our solar system has liquid water on its surface.
The next feature that stands out is the scattered clouds th