Question

brief explanation about sphere​

Answer 1

Mark It Brainleist.

A Sphere (From Greek Σφαῖρα — Sphaira, "Globe, Ball") Is A Perfectly Round Geometrical Object In Three-dimensional Space That Is The Surface Of A Completely Round Ball (Viz., Analogous To The Circular Objects In Two Dimensions, Where A "Circle" Circumscribes Its "Disk").

Answer 2

Everything in earth's system can be placed into one of four major subsystems : land, water, living things and air. These four subsystems are called 'spheres'.
specifically they are the Lithosphere (land),Hydrosphere (water), Biosphere (living things), and Atmosphere (air).