Answer:
The word "sphere" is present in the names of Earth's systems because these systems are interconnected and interact with one another. The term "sphere" is used to describe the shape of these systems, which are roughly spherical.
Explanation:
1. The first system is the geosphere, which refers to the solid part of Earth, including the rocks, minerals, and landforms. It is called the geosphere because it is shaped like a sphere, although it is not a perfect sphere.
2. The second system is the hydrosphere, which includes all of Earth's water, such as oceans, lakes, rivers, and even atmospheric water vapor. The hydrosphere is also shaped like a sphere because water tends to collect and flow downwards due to gravity, forming bodies of water that take on a roughly spherical shape.
3. The third system is the atmosphere, which is the layer of gases that surrounds Earth. While the atmosphere does not have a specific shape, it extends around the geosphere and hydrosphere, creating a layer that resembles a sphere.
4. Finally, the biosphere refers to all living organisms on Earth and their interactions with the other systems. While the biosphere is not a physical sphere, it depends on the other systems and is interconnected with them.
The use of the word "sphere" in these system names helps to convey the idea that these systems are interconnected and influence one another. It also emphasizes the importance of understanding the Earth as a whole rather than studying each system in isolation.