a

Hydrosphere
b
Atmosphere
c
Biosphere
d
Geosphere

a) Hydrosphere - the Earth's water in all its forms, including oceans, rivers, lakes, glaciers, and groundwater.

b) Atmosphere - the layer of gases that surrounds the Earth, including nitrogen, oxygen, carbon dioxide, and other gases.

c) Biosphere - the part of Earth where life exists, including all living organisms and their interactions with each other and their environment.

d) Geosphere - the solid part of Earth, including rocks, minerals, and landforms.