Question

difine sun amd also difine the structure of rarth​

Answer 1

The structure of the Earth is divided into layers. ... The Earth has an outer solid layer called the crust, a highly viscous layer called the mantle, a liquid layer that is the outer part of the core, called the outer core, and a solid center called the inner core.

Answer 2

the sun is a star that shine in the sky and it gives warmth to the earth.

nuclear fusion reaction takes place in it. it is made up of hot gases ,hydrogen and helium are present in sun in large amount ,in both gases amount of hydrogen is large. two hydrogen atom fuse and make helium atom.

earth has four layers

crust , mantle,outer core and inner core.
crust is the outermost layer of earth and earth's surface is the part of crust
mantle is the middle layer between crust and core.