Which ecological system includes Earth's water bodies such as oceans and rivers?

Which ecological system includes Earth's water bodies such as oceans and rivers?

• A. Atmosphere
• B. Geosphere
• C. Hydrosphere
• D. Cryosphere

Answer: (C)

The concept being tested is which Earth system contains all the planet’s water bodies. The oceans, rivers, lakes, groundwater, and even water vapor across the globe are part of the hydrosphere, which is defined by encompassing all water in any form. That makes the hydrosphere the best fit for describing Earth’s water bodies like oceans and rivers. The atmosphere is the gaseous envelope of the planet and water within it is in vapor form, not the liquid bodies themselves. The geosphere refers to the solid Earth—rocks, minerals, soils—rather than bodies of water. The cryosphere deals with frozen water such as ice caps and glaciers, which is a subset of water forms but does not describe the liquid water in oceans and rivers.

The concept being tested is which Earth system contains all the planet’s water bodies. The oceans, rivers, lakes, groundwater, and even water vapor across the globe are part of the hydrosphere, which is defined by encompassing all water in any form. That makes the hydrosphere the best fit for describing Earth’s water bodies like oceans and rivers. The atmosphere is the gaseous envelope of the planet and water within it is in vapor form, not the liquid bodies themselves. The geosphere refers to the solid Earth—rocks, minerals, soils—rather than bodies of water. The cryosphere deals with frozen water such as ice caps and glaciers, which is a subset of water forms but does not describe the liquid water in oceans and rivers.