The term Geosphere is often used to refer to the densest (solid) parts of a planet, which consist mostly of rock and regolith [Wikipedia]
A hydrosphere in physical geography describes the combined mass of water found on, under, and over the surface of a planet. [Wikipedia]
The part of a planetary surface that is a solid
An ocean is a major body of saline water, and a principal component of the hydrosphere. [Wikipedia]
An atmosphere is a layer of gases that may surround a material body of sufficient mass,[1] by the gravity of the body, and are retained for a longer duration if gravity is high and the atmosphere's temperature is low. [Wikipedia]
The cryosphere collectively describes the portions of a planetary surface in frozen form, including sea ice, lake ice, river ice, snow cover, glaciers, ice caps and ice sheets, and frozen ground (which includes permafrost). [Wikipedia]
The surface of the planet defined by solid and/or liquid layers
A qusai-horizontal surface spanning all or part of a planet that corresponds to a constant value of some parameter