A healthy river has nitrogen, oxygen, carbon dioxide and various minerals dissolved in it. These are used by algae, fish, and other organisms living in the water. There are also small mineral fragments from rocks and clays suspended in the water.Which of Earth's four systems are present in a healthy river? Explain.

The four Earth's systems present in a healthy river are:

1. The Geosphere: This is represented by the mineral fragments from rocks and clays suspended in the water. These fragments are part of the Earth's crust and mantle, which make up the geosphere.

2. The Hydrosphere: This is represented by the water in the river itself. The hydrosphere includes all of Earth's water, both on the surface and underground.

3. The Biosphere: This is represented by the algae, fish, and other organisms living in the water. The biosphere includes all of Earth's ecosystems and living organisms.

4. The Atmosphere: This is represented by the nitrogen, oxygen, and carbon dioxide dissolved in the water. These gases are part of Earth's atmosphere, which also includes other gases, clouds, and particles in the air.